Add Vietnamese translations
Merge pull request #203 from WorldBank-Transport/feature/vietnamese-translations

Add Vietnamese translations
Add Chinese translations
Merge pull request #204 from WorldBank-Transport/feature/chinese-translations

Add Chinese translations
Add indicator calculation button
Add English strings for Scenario tab.
Cleanup based on PR feedback
Merge pull request #202 from WorldBank-Transport/feature/calculate-button

Add indicator calculation button
Fix Chinese translations

The translator put them in the msgid instead of the msgstr, so I just
copy-pasted. I tried to match up the line numbers as best I could so
that hopefully everything ended up in the right spot.
Merge pull request #206 from WorldBank-Transport/feature/fix-chinese-i18n

Fix Chinese translations
Merge pull request #205 from WorldBank-Transport/feature/scenarios-translations

Add English strings for Scenario tab.
Add stacked chart for transit length indicator

Filters indicator endpoint to only return system/mode indicators

Refactors some of the stuff in data-controller to data-service
and attempts to clean up the chart definition objects.

See notes in data-partial.html regarding use of ng-init
to temporarily store data transformations.