Add support for multiple languages since the beginning

[hacdias]

We should add a library to support multiple languages right from the beginning to make it easier to expand after this revamp is finished. What do you think?

/cc @olizilla @lidel @alanshaw

[olizilla]

💯

Current state is documented here: https://github.com/ipfs-shipyard/pm-ipfs-gui/issues/50

• Existing webui uses https://www.transifex.com/
• Companion uses https://crowdin.com/

of note, crowdin is the localization service of choice for node js and electron

• https://medium.com/the-node-js-collection/internationalizing-node-js-fe7761798b0a
• https://github.com/nodejs/i18n

[lidel]

Keep in mind that setting up a unified crowdsourcing website for all GUI apps should be done at the end of revamp endeavor to decrease noise/breaking changes until we have all screens implemented.

Until then, there are things that need to happen first:

• [x] research and pick i18n library that uses future-proof format
  • the most popular seems to be yahoo/react-intl and they use ICU format:
    • http://userguide.icu-project.org/formatparse/messages
    • http://icu-project.org/apiref/icu4j/com/ibm/icu/text/MessageFormat.html
    • https://blog.crowdin.com/2016/11/09/icu-syntax-in-crowdin
  • are there better alternatives (libs, formats)?
• [x] create English translation by moving existing text from app to locale files
  • from this point forward all new labels will be added to English locale

Digression: The key is to respect time of translators and do not ask from contributions until we are sure locales work as expected and won't change drastically. For example, when initial revamp work is done, we could smoke-test translation process by adding Polish and Portuguese locales to iron out all kinks before opening project to accepting external translations via crowdsourcing site.

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Meta issue for GUI Translation Project: https://github.com/ipfs/ipfs-gui/issues/50

[lidel]

I think we've done it all :sparkles: :rocket:

WebUI uses i18next with JSON+ICU format and we a fancy crowdsourcing website for translations (context: https://github.com/ipfs/ipfs-gui/issues/50):

• https://www.transifex.com/ipfs/ipfs-webui/

Source strings (en) are synchronized once a day.