diff --git a/.github/workflows/django.yml b/.github/workflows/django.yml
index 4c3e7ee..059f4c9 100644
--- a/.github/workflows/django.yml
+++ b/.github/workflows/django.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 2
       matrix:
-        python-version: ['3.12', '3.13']
+        python-version: ['3.13', '3.14']
 
     steps:
     - uses: actions/checkout@v3
diff --git a/ram/bookshelf/admin.py b/ram/bookshelf/admin.py
index ba57d98..4fea47f 100644
--- a/ram/bookshelf/admin.py
+++ b/ram/bookshelf/admin.py
@@ -2,7 +2,7 @@ import html
 
 from django.conf import settings
 from django.contrib import admin
-from django.utils.html import format_html, strip_tags
+from django.utils.html import format_html, format_html_join, strip_tags
 from adminsortable2.admin import SortableAdminBase, SortableInlineAdminMixin
 
 from ram.admin import publish, unpublish
@@ -133,13 +133,14 @@ class BookAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Invoices")
     def invoices(self, obj):
         if obj.invoice.exists():
-            html = "<br>".join(
-                "<a href=\"{}\" target=\"_blank\">{}</a>".format(
-                    i.file.url, i
-                ) for i in obj.invoice.all())
+            html = format_html_join(
+                "<br>",
+                "<a href=\"{}\" target=\"_blank\">{}</a>",
+                ((i.file.url, i) for i in obj.invoice.all())
+            )
         else:
             html = "-"
-        return format_html(html)
+        return html
 
     @admin.display(description="Publisher")
     def get_publisher(self, obj):
@@ -217,7 +218,7 @@ class PublisherAdmin(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}'.format(obj.country.flag, obj.country.name)
+            '<img src="{}" /> {}', obj.country.flag, obj.country.name
         )
 
 
@@ -295,13 +296,14 @@ class CatalogAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Invoices")
     def invoices(self, obj):
         if obj.invoice.exists():
-            html = "<br>".join(
-                "<a href=\"{}\" target=\"_blank\">{}</a>".format(
-                    i.file.url, i
-                ) for i in obj.invoice.all())
+            html = format_html_join(
+                "<br>",
+                "<a href=\"{}\" target=\"_blank\">{}</a>",
+                ((i.file.url, i) for i in obj.invoice.all())
+            )
         else:
             html = "-"
-        return format_html(html)
+        return html
 
     def download_csv(modeladmin, request, queryset):
         header = [
diff --git a/ram/bookshelf/migrations/0016_basebook_book_catalogue.py b/ram/bookshelf/migrations/0016_basebook_book_catalogue.py
index 5e44540..e465782 100644
--- a/ram/bookshelf/migrations/0016_basebook_book_catalogue.py
+++ b/ram/bookshelf/migrations/0016_basebook_book_catalogue.py
@@ -1,7 +1,8 @@
 # Generated by Django 5.1.2 on 2024-11-27 16:35
 
 import django.db.models.deletion
-from django.db import migrations, models
+from django.db import migrations, models, connection
+from django.db.utils import ProgrammingError, OperationalError
 
 
 def basebook_to_book(apps, schema_editor):
@@ -16,6 +17,19 @@ def basebook_to_book(apps, schema_editor):
         b.authors.set(row.old_authors.all())
 
 
+def drop_temporary_tables(apps, schema_editor):
+    try:
+        with connection.cursor() as cursor:
+            cursor.execute(
+                'DROP TABLE IF EXISTS bookshelf_basebook_old_authors'
+            )
+            cursor.execute(
+                'DROP TABLE IF EXISTS bookshelf_basebook_authors'
+            )
+    except (ProgrammingError, OperationalError):
+        pass
+
+
 class Migration(migrations.Migration):
 
     dependencies = [
@@ -101,10 +115,6 @@ class Migration(migrations.Migration):
             model_name="basebook",
             name="old_title",
         ),
-        migrations.RemoveField(
-            model_name="basebook",
-            name="old_authors",
-        ),
         migrations.RemoveField(
             model_name="basebook",
             name="old_publisher",
@@ -138,4 +148,16 @@ class Migration(migrations.Migration):
             },
             bases=("bookshelf.basebook",),
         ),
+        # Required by Dajngo 6.0 on SQLite
+        migrations.SeparateDatabaseAndState(
+            state_operations=[
+                migrations.RemoveField(
+                    model_name="basebook",
+                    name="old_authors",
+                ),
+            ],
+            database_operations=[
+                migrations.RunPython(drop_temporary_tables)
+            ]
+        ),
     ]
diff --git a/ram/bookshelf/migrations/0024_alter_basebook_language.py b/ram/bookshelf/migrations/0024_alter_basebook_language.py
new file mode 100644
index 0000000..b7f5c5c
--- /dev/null
+++ b/ram/bookshelf/migrations/0024_alter_basebook_language.py
@@ -0,0 +1,123 @@
+# Generated by Django 6.0 on 2025-12-03 22:07
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookshelf", "0023_delete_basebookdocument"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="basebook",
+            name="language",
+            field=models.CharField(
+                choices=[
+                    ("af", "Afrikaans"),
+                    ("ar", "Arabic"),
+                    ("ar-dz", "Algerian Arabic"),
+                    ("ast", "Asturian"),
+                    ("az", "Azerbaijani"),
+                    ("bg", "Bulgarian"),
+                    ("be", "Belarusian"),
+                    ("bn", "Bengali"),
+                    ("br", "Breton"),
+                    ("bs", "Bosnian"),
+                    ("ca", "Catalan"),
+                    ("ckb", "Central Kurdish (Sorani)"),
+                    ("cs", "Czech"),
+                    ("cy", "Welsh"),
+                    ("da", "Danish"),
+                    ("de", "German"),
+                    ("dsb", "Lower Sorbian"),
+                    ("el", "Greek"),
+                    ("en", "English"),
+                    ("en-au", "Australian English"),
+                    ("en-gb", "British English"),
+                    ("eo", "Esperanto"),
+                    ("es", "Spanish"),
+                    ("es-ar", "Argentinian Spanish"),
+                    ("es-co", "Colombian Spanish"),
+                    ("es-mx", "Mexican Spanish"),
+                    ("es-ni", "Nicaraguan Spanish"),
+                    ("es-ve", "Venezuelan Spanish"),
+                    ("et", "Estonian"),
+                    ("eu", "Basque"),
+                    ("fa", "Persian"),
+                    ("fi", "Finnish"),
+                    ("fr", "French"),
+                    ("fy", "Frisian"),
+                    ("ga", "Irish"),
+                    ("gd", "Scottish Gaelic"),
+                    ("gl", "Galician"),
+                    ("he", "Hebrew"),
+                    ("hi", "Hindi"),
+                    ("hr", "Croatian"),
+                    ("hsb", "Upper Sorbian"),
+                    ("ht", "Haitian Creole"),
+                    ("hu", "Hungarian"),
+                    ("hy", "Armenian"),
+                    ("ia", "Interlingua"),
+                    ("id", "Indonesian"),
+                    ("ig", "Igbo"),
+                    ("io", "Ido"),
+                    ("is", "Icelandic"),
+                    ("it", "Italian"),
+                    ("ja", "Japanese"),
+                    ("ka", "Georgian"),
+                    ("kab", "Kabyle"),
+                    ("kk", "Kazakh"),
+                    ("km", "Khmer"),
+                    ("kn", "Kannada"),
+                    ("ko", "Korean"),
+                    ("ky", "Kyrgyz"),
+                    ("lb", "Luxembourgish"),
+                    ("lt", "Lithuanian"),
+                    ("lv", "Latvian"),
+                    ("mk", "Macedonian"),
+                    ("ml", "Malayalam"),
+                    ("mn", "Mongolian"),
+                    ("mr", "Marathi"),
+                    ("ms", "Malay"),
+                    ("my", "Burmese"),
+                    ("nb", "Norwegian Bokmål"),
+                    ("ne", "Nepali"),
+                    ("nl", "Dutch"),
+                    ("nn", "Norwegian Nynorsk"),
+                    ("os", "Ossetic"),
+                    ("pa", "Punjabi"),
+                    ("pl", "Polish"),
+                    ("pt", "Portuguese"),
+                    ("pt-br", "Brazilian Portuguese"),
+                    ("ro", "Romanian"),
+                    ("ru", "Russian"),
+                    ("sk", "Slovak"),
+                    ("sl", "Slovenian"),
+                    ("sq", "Albanian"),
+                    ("sr", "Serbian"),
+                    ("sr-latn", "Serbian Latin"),
+                    ("sv", "Swedish"),
+                    ("sw", "Swahili"),
+                    ("ta", "Tamil"),
+                    ("te", "Telugu"),
+                    ("tg", "Tajik"),
+                    ("th", "Thai"),
+                    ("tk", "Turkmen"),
+                    ("tr", "Turkish"),
+                    ("tt", "Tatar"),
+                    ("udm", "Udmurt"),
+                    ("ug", "Uyghur"),
+                    ("uk", "Ukrainian"),
+                    ("ur", "Urdu"),
+                    ("uz", "Uzbek"),
+                    ("vi", "Vietnamese"),
+                    ("zh-hans", "Simplified Chinese"),
+                    ("zh-hant", "Traditional Chinese"),
+                ],
+                default="en",
+                max_length=7,
+            ),
+        ),
+    ]
diff --git a/ram/consist/admin.py b/ram/consist/admin.py
index 472b6a0..135760a 100644
--- a/ram/consist/admin.py
+++ b/ram/consist/admin.py
@@ -54,7 +54,7 @@ class ConsistAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}'.format(obj.country.flag, obj.country)
+            '<img src="{}" /> {}', obj.country.flag, obj.country
         )
 
     fieldsets = (
diff --git a/ram/metadata/admin.py b/ram/metadata/admin.py
index c017394..d3f30b5 100644
--- a/ram/metadata/admin.py
+++ b/ram/metadata/admin.py
@@ -54,7 +54,7 @@ class CompanyAdmin(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}'.format(obj.country.flag, obj.country.name)
+            '<img src="{}" /> {}', obj.country.flag, obj.country.name
         )
 
 
@@ -68,7 +68,7 @@ class ManufacturerAdmin(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}'.format(obj.country.flag, obj.country.name)
+            '<img src="{}" /> {}', obj.country.flag, obj.country.name
         )
 
 
diff --git a/ram/portal/templates/includes/login.html b/ram/portal/templates/includes/login.html
index f9d69a7..6001cbc 100644
--- a/ram/portal/templates/includes/login.html
+++ b/ram/portal/templates/includes/login.html
@@ -11,9 +11,10 @@
             <ul class="dropdown-menu" aria-labelledby="dropdownLogin">
               <li><a class="dropdown-item" href="{% url 'admin:roster_rollingstock_changelist' %}">Rolling stock</a></li>
               <li><a class="dropdown-item" href="{% url 'admin:consist_consist_changelist' %}">Consists</a></li>
-              <li><a class="dropdown-item" href="{% url 'admin:app_list' 'metadata' %}">Metadata</a></li>
-              <li><a class="dropdown-item" href="{% url 'admin:portal_flatpage_changelist' %}">Pages</a></li>
               <li><a class="dropdown-item" href="{% url 'admin:app_list' 'bookshelf' %}">Bookshelf</a></li>
+              <li><a class="dropdown-item" href="{% url 'admin:portal_flatpage_changelist' %}">Pages</a></li>
+              <li><a class="dropdown-item" href="{% url 'admin:app_list' 'repository' %}">Repository</a></li>
+              <li><a class="dropdown-item" href="{% url 'admin:app_list' 'metadata' %}">Metadata</a></li>
               <li><hr class="dropdown-divider"></li>
               <li><a class="dropdown-item" href="{% url 'admin:index' %}">Admin</a></li>
               <li><a class="dropdown-item" href="{% url 'admin:portal_siteconfiguration_changelist' %}">Site configuration</a></li>
diff --git a/ram/portal/templatetags/dcc.py b/ram/portal/templatetags/dcc.py
index c1ff7e9..ab3c1c0 100644
--- a/ram/portal/templatetags/dcc.py
+++ b/ram/portal/templatetags/dcc.py
@@ -1,36 +1,38 @@
 from django import template
 from django.utils.html import format_html
+from django.utils.safestring import mark_safe
 
 register = template.Library()
 
 
 @register.simple_tag
 def dcc(object):
-    socket = (
+    socket = mark_safe(
         '<i class="bi bi-ban small"></i>'
     )
     decoder = ''
     if object.decoder_interface is not None:
-        socket = (
+        socket = mark_safe(
             f'<abbr title="{object.get_decoder_interface()}">'
             f'<i class="bi bi-dice-6"></i></abbr>'
         )
     if object.decoder:
         if object.decoder.sound:
-            decoder = (
+            decoder = mark_safe(
                 f'<abbr title="{object.decoder}">'
                 '<i class="bi bi-volume-up-fill"></i></abbr>'
             )
         else:
-            decoder = (
+            decoder = mark_safe(
                 f'<abbr title="{object.decoder}'
                 f'({object.get_decoder_interface()})">'
                 '<i class="bi bi-cpu-fill"></i></abbr>'
             )
-
     if decoder:
         return format_html(
-            f'{socket} <i class="bi bi-arrow-bar-left"></i>{decoder}'
+            '{} <i class="bi bi-arrow-bar-left"></i> {}',
+            socket,
+            decoder,
         )
 
-    return format_html(socket)
+    return socket
diff --git a/ram/ram/__init__.py b/ram/ram/__init__.py
index ff3fbc5..14731ee 100644
--- a/ram/ram/__init__.py
+++ b/ram/ram/__init__.py
@@ -1,4 +1,4 @@
 from ram.utils import git_suffix
 
-__version__ = "0.17.14"
+__version__ = "0.17.15"
 __version__ += git_suffix(__file__)
diff --git a/ram/ram/utils.py b/ram/ram/utils.py
index b5c5e94..f60b1f3 100644
--- a/ram/ram/utils.py
+++ b/ram/ram/utils.py
@@ -48,8 +48,9 @@ def git_suffix(fname):
 
 def get_image_preview(url, max_size=150):
     return format_html(
-        '<img src="{src}" style="max-width: {size}px; max-height: {size}px;'
-        'background-color: #eee;" />'.format(src=url, size=max_size)
+        '<img src="{src}" style="max-width: {size}px; max-height: {size}px; background-color: #eee;" />',  # noqa: E501
+        src=url,
+        size=max_size,
     )
 
 
diff --git a/ram/roster/admin.py b/ram/roster/admin.py
index e7908fa..9d291e2 100644
--- a/ram/roster/admin.py
+++ b/ram/roster/admin.py
@@ -2,7 +2,7 @@ import html
 
 from django.conf import settings
 from django.contrib import admin
-from django.utils.html import format_html, strip_tags
+from django.utils.html import format_html, format_html_join, strip_tags
 
 from adminsortable2.admin import SortableAdminBase, SortableInlineAdminMixin
 
@@ -44,7 +44,7 @@ class RollingClass(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}'.format(obj.country.flag, obj.country)
+            '<img src="{}" /> {}', obj.country.flag, obj.country.name
         )
 
 
@@ -152,7 +152,7 @@ class RollingStockAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}'.format(obj.country.flag, obj.country)
+            '<img src="{}" /> {}', obj.country.flag, obj.country.name
         )
 
     fieldsets = (
@@ -222,13 +222,14 @@ class RollingStockAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Invoices")
     def invoices(self, obj):
         if obj.invoice.exists():
-            html = "<br>".join(
-                "<a href=\"{}\" target=\"_blank\">{}</a>".format(
-                    i.file.url, i
-                ) for i in obj.invoice.all())
+            html = format_html_join(
+                "<br>",
+                "<a href=\"{}\" target=\"_blank\">{}</a>",
+                ((i.file.url, i) for i in obj.invoice.all())
+            )
         else:
             html = "-"
-        return format_html(html)
+        return html
 
     def download_csv(modeladmin, request, queryset):
         header = [