Show which file format is current

Fixes #1037
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/html/translation-download.html

 {% load i18n %}
 
-<li><a href="{% url 'download_translation' project=object.subproject.project.slug subproject=object.subproject.slug lang=object.language.code %}" title="{% trans "Download for an offline translation." %}">{% trans "Download original translation file" %}</a></li>
+<li><a href="{% url 'download_translation' project=object.subproject.project.slug subproject=object.subproject.slug lang=object.language.code %}" title="{% trans "Download for an offline translation." %}">{% blocktrans with object.subproject.file_format_name as format %}Download original translation file ({{format}}){% endblocktrans %}</a></li>
 <li><a href="{% url 'download_translation_format' project=object.subproject.project.slug subproject=object.subproject.slug lang=object.language.code fmt='xliff'%}" title="{% trans "Download for an offline translation." %}">{% trans "Download translation as XLIFF" %}</a></li>
 <li><a href="{% url 'download_translation_format' project=object.subproject.project.slug subproject=object.subproject.slug lang=object.language.code fmt='xliff12'%}" title="{% trans "Download for an offline translation." %}">{% trans "Download translation as XLIFF 1.2" %}</a></li>
 <li><a href="{% url 'download_translation_format' project=object.subproject.project.slug subproject=object.subproject.slug lang=object.language.code fmt='po'%}" title="{% trans "Download for an offline translation." %}">{% trans "Download translation as Gettext PO" %}</a></li>

weblate/trans/models/subproject.py

@@ -1372,6 +1372,10 @@ class SubProject(models.Model, PercentMixin, URLMixin, PathMixin):
         """Checks whether there is something to push to remote repository"""
         return self.repository.needs_push()
 
+    @property
+    def file_format_name(self):
+        return self.file_format_cls.name
+
     @property
     def file_format_cls(self):
         """Returns file format object """