Merge pull request #229 from WorldBank-Transport/feature/missed-migration

Add missed AlterField migration
Readd missing glyphicons css dependency
Merge pull request #231 from WorldBank-Transport/feature/glyphicons-css

Readd missing glyphicons css dependency
Add export indicators button
Merge pull request #233 from WorldBank-Transport/feature/add-export-button

Add export indicators button
Fetch legend text on translation change.
Return translated GTFS Route Type

Since the description was simply a CharField that was constructed upon
model initialization, it wasn't translatable. This returns the
human-readable string from gtfs.GTFSRouteTypes.CHOICES, which is static
and can therefore be translated.
Remove GTFSRouteType description field.
Make Angular respect language cookies on initial page load.