Applies changes needed to serve locale files as static content (#11234)

* moving locales folder to /public and applying changes needed to serve locales as static files

* better dev/prod check

* transifex pull script changes to match new locales directory + ignore locales with less than 100 lines

* fix local/prod locales path

* merge fallback messages

* applies new locale changes to legacy client

`bbb-html5.nginx` file content should also be changed to the following:

```
location /html5client/locales {
  alias /usr/share/meteor/bundle/programs/web.browser/app/locales;
}

location /html5client/compatibility {
  alias /usr/share/meteor/bundle/programs/web.browser/app/compatibility;
}

location /html5client/resources {
  alias /usr/share/meteor/bundle/programs/web.browser/app/resources;
}

location /html5client/svgs {
  alias /usr/share/meteor/bundle/programs/web.browser/app/svgs;
}

location /html5client/fonts {
  alias /usr/share/meteor/bundle/programs/web.browser/app/fonts;
}

location /html5client {
  # proxy_pass http://127.0.0.1:4100; # use for development
  proxy_pass http://poolhtml5servers; # use for production
  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "Upgrade";
}
```