lang: Introduce Qt specific plurals

These were derived from CLDR back then, but they are not being updated.

See translate/translate#786

weblate/formats/ttkit.py

@@ -1207,6 +1207,10 @@ class TSFormat(TTKitFormat):
     unit_class = TSUnit
     set_context_bilingual = False
     supports_plural: bool = True
+    plural_preference = (
+        Plural.SOURCE_QT,
+        Plural.SOURCE_DEFAULT,
+    )
 
 
 class XliffFormat(TTKitFormat):

weblate/lang/migrations/0002_alter_plural_source.py

@@ -0,0 +1,33 @@
+# Copyright © Michal Čihař <[email protected]>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Generated by Django 4.2.8 on 2023-12-19 11:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("lang", "0001_squashed_weblate_5"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="plural",
+            name="source",
+            field=models.SmallIntegerField(
+                choices=[
+                    (0, "Default plural"),
+                    (1, "gettext plural formula"),
+                    (3, "CLDR plural with zero"),
+                    (4, "CLDR v38+ plural"),
+                    (5, "Android plural"),
+                    (6, "Qt Linguist plural"),
+                    (2, "Manually entered formula"),
+                ],
+                default=0,
+                verbose_name="Plural definition source",
+            ),
+        ),
+    ]

weblate/lang/models.py

@@ -24,7 +24,7 @@
 from django.utils.translation.trans_real import parse_accept_lang_header
 from weblate_language_data.aliases import ALIASES
 from weblate_language_data.countries import DEFAULT_LANGS
-from weblate_language_data.plurals import CLDRPLURALS, EXTRAPLURALS
+from weblate_language_data.plurals import CLDRPLURALS, EXTRAPLURALS, QTPLURALS
 from weblate_language_data.rtl import RTL_LANGS
 
 from weblate.checks.format import BaseFormatCheck
@@ -501,6 +501,7 @@ def setup(self, update, logger=lambda x: x):
         extra_plurals = (
             (Plural.SOURCE_GETTEXT, EXTRAPLURALS),
             (Plural.SOURCE_CLDR, CLDRPLURALS),
+            (Plural.SOURCE_QT, QTPLURALS),
         )
         for source, definitions in extra_plurals:
             for code, _unused, nplurals, plural_formula in definitions:
@@ -767,6 +768,7 @@ class Plural(models.Model):
     SOURCE_CLDR_ZERO = 3
     SOURCE_CLDR = 4
     SOURCE_ANDROID = 5
+    SOURCE_QT = 6
     source = models.SmallIntegerField(
         default=SOURCE_DEFAULT,
         verbose_name=gettext_lazy("Plural definition source"),
@@ -776,6 +778,7 @@ class Plural(models.Model):
             (SOURCE_CLDR_ZERO, gettext_lazy("CLDR plural with zero")),
             (SOURCE_CLDR, gettext_lazy("CLDR v38+ plural")),
             (SOURCE_ANDROID, gettext_lazy("Android plural")),
+            (SOURCE_QT, gettext_lazy("Qt Linguist plural")),
             (SOURCE_MANUAL, gettext_lazy("Manually entered formula")),
         ),
     )