Add UTF-16 variant of Java properties

We override the encoding for the iso-8859-1 as the detection engine just
forces it to be utf-8.

Fixes #851
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/formats.py

@@ -941,18 +941,29 @@ class PropertiesUtf8Format(FileFormat):
     new_translation = '\n'
 
 
+@register_fileformat
+class PropertiesUtf16Format(PropertiesUtf8Format):
+    name = _('Java Properties (UTF-16)')
+    format_id = 'properties-utf16'
+    loader = ('properties', 'javafile')
+    autoload = ('.properties',)
+
+
 @register_fileformat
 class PropertiesFormat(PropertiesUtf8Format):
-    name = _('Java Properties')
+    name = _('Java Properties (ISO-8859-1)')
     format_id = 'properties'
     loader = ('properties', 'javafile')
-    autoload = ('.properties',)
 
     @classmethod
     def fixup(cls, store):
         '''
         Java properties need to be iso-8859-1, but
         ttkit converts them to utf-8.
+
+        This will be fixed in translate-toolkit 1.14.0, we could then
+        merge utf-16 and this one as the encoding detection should do
+        the correct magic then.
         '''
         store.encoding = 'iso-8859-1'
         return store