formats: Add appstore languge naming

This is merely a BCP style with few overrides.

Fixes #5522

docs/admin/languages.rst

@@ -200,11 +200,16 @@ BCP style using hyphen as a separator
 BCP style using hyphen as a separator, including country code
    BCP style language code including the country code even when not necessary
    (for example ``cs-CZ``).
+BCP style using hyphen as a separator, legacy language codes
+   Uses legacy codes for Chinese and BCP style notation.
+BCP style using hyphen as a separator, lower cased
+   BCP style notation, all in lower case (for examle ``cs-cz``).
+App store metadata style
+   Style suitable for uploading metadata to appstores. This should be suitable
+   for both Apple App Store and Google Play Store.
 Android style
    Only used in Android apps, produces language codes like
    ``pt-rBR``.
-BCP style using hyphen as a separator, legacy language codes
-   Uses legacy codes for Chinese and BCP style notation.
 Linux style
    Locales as used by Linux, uses legacy codes for Chinese and POSIX style notation.
 

weblate/formats/base.py

@@ -45,6 +45,13 @@
     "zh_Hans_SG": "zh_SG",
     "zh_Hant_HK": "zh_HK",
 }
+APPSTORE_CODES = {
+    "ar": "ar-SA",
+    "de": "de-DE",
+    "fr": "fr-FR",
+    "nl": "nl-NL",
+    "pt": "pt-PT",
+}
 
 
 class UnitNotFound(Exception):
@@ -490,6 +497,11 @@ def get_language_bcp_legacy(cls, code: str) -> str:
         """BCP, but doesn't use Hans/Hant, but rather TW/CN variants."""
         return cls.get_language_bcp(cls.get_language_linux(code))
 
+    @classmethod
+    def get_language_appstore(cls, code: str) -> str:
+        """App store language codes."""
+        return cls.get_language_bcp(APPSTORE_CODES.get(code, code))
+
     @classmethod
     def get_language_filename(cls, mask: str, code: str) -> str:
         """

weblate/formats/txt.py

@@ -191,7 +191,7 @@ class AppStoreFormat(TranslationFormat):
     monolingual = True
     unit_class = TextUnit
     simple_filename = False
-    language_format = "bcp_legacy"
+    language_format = "appstore"
     create_style = "directory"
 
     def load(self, storefile, template_store):

weblate/trans/models/component.py

@@ -141,6 +141,7 @@
         "bcp_legacy",
         gettext_lazy("BCP style using hyphen as a separator, legacy language codes"),
     ),
+    ("appstore", gettext_lazy("App store metadata style")),
     ("linux", gettext_lazy("Linux style")),
 )