Be consistent in component terminology

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

weblate/trans/admin.py

@@ -254,7 +254,7 @@ class GroupACLAdmin(admin.ModelAdmin):
             return obj.subproject
         else:
             return obj.project
-    project_subproject.short_description = _('Project / Subproject')
+    project_subproject.short_description = _('Project / Component')
 
 
 # Register in admin interface