Translate Language names to Japanese

[tuttiq]

Is your feature request related to a problem? Please describe.

Follow-up from #176
Language names are only in English or native language right now.

Describe the solution you'd like

• Add name_ja field to Languages
• Anywhere where we show languages name_en, add a conditional to show name_ja instead if the locale is Japanese

Additional context

Background discussion on #176

[tuttiq]

This issue requires data population on the production database before merging, cc Airtable admins: @tuttiq @ann-kilzer @yanarchy

[ann-kilzer]

Let's translate the language names in this spreadsheet: https://docs.google.com/spreadsheets/d/1AdLV8xPSNDC-yuhGdgp-J2WFCkVRXRWFr9fBioBZKAU/edit#gid=0

@shokokb We would love your help here 💕

[shokokb]

@ann-kilzer I finished https://docs.google.com/spreadsheets/d/1AdLV8xPSNDC-yuhGdgp-J2WFCkVRXRWFr9fBioBZKAU/edit#gid=0