Add MODELTRANSLATION_LANGUAGES setting.

docs/modeltranslation/installation.rst

@@ -116,9 +116,18 @@ and ``en`` in your project, set the ``LANGUAGES`` variable like this (where
     rather required for Django to be able to (statically) translate the verbose
     names of the languages using the standard ``i18n`` solution.
 
+.. note::
+    If, for some reason, you don't want to translate objects to exactly the same languages as
+    the site would be displayed into, you can set ``MODELTRANSLATION_LANGUAGES`` (see below).
+    For any language in ``LANGUAGES`` not present in ``MODELTRANSLATION_LANGUAGES``, the *default
+    language* will be used when accessing translated content. For any language in
+    ``MODELTRANSLATION_LANGUAGES`` not present in ``LANGUAGES``, probably nobody will see translated
+    content, since the site wouldn't be accessible in that language.
+
 .. warning::
     Modeltranslation does not enforce the ``LANGUAGES`` setting to be defined
-    in your project. When it isn't present, it defaults to Django's
+    in your project. When it isn't present (and neither is ``MODELTRANSLATION_LANGUAGES``), it
+    defaults to Django's
     `global LANGUAGES setting <https://github.com/django/django/blob/master/django/conf/global_settings.py>`_
     instead, and that are quite a number of languages!
 
@@ -147,6 +156,28 @@ Example::
     MODELTRANSLATION_DEFAULT_LANGUAGE = 'en'
 
 
+``MODELTRANSLATION_LANGUAGES``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. versionadded:: 0.8
+
+Default: same as ``LANGUAGES``
+
+Allow to set languages the content will be translated into. If not set, by default all
+languages listed in ``LANGUAGES`` will be used.
+
+Example::
+
+    LANGUAGES = (
+        ('en', 'English'),
+        ('de', 'German'),
+        ('pl', 'Polish'),
+    )
+    MODELTRANSLATION_LANGUAGES = ('en', 'de')
+
+.. note:: We doubt this setting will ever be needed, but why not add it since we can?
+
+
 .. _settings-modeltranslation_fallback_languages:
 
 ``MODELTRANSLATION_FALLBACK_LANGUAGES``

modeltranslation/settings.py

@@ -5,7 +5,8 @@ from django.core.exceptions import ImproperlyConfigured
 
 TRANSLATION_FILES = tuple(getattr(settings, 'MODELTRANSLATION_TRANSLATION_FILES', ()))
 
-AVAILABLE_LANGUAGES = [l[0] for l in settings.LANGUAGES]
+AVAILABLE_LANGUAGES = getattr(settings, 'MODELTRANSLATION_LANGUAGES',
+                              [l[0] for l in settings.LANGUAGES])
 DEFAULT_LANGUAGE = getattr(settings, 'MODELTRANSLATION_DEFAULT_LANGUAGE', None)
 if DEFAULT_LANGUAGE and DEFAULT_LANGUAGE not in AVAILABLE_LANGUAGES:
     raise ImproperlyConfigured('MODELTRANSLATION_DEFAULT_LANGUAGE not in LANGUAGES setting.')