Added remote API endpoint to trigger translations

This slightly refactors the action class to make the push_translations
method reusable via the API endpoint. It introduces Exception for error
signa

Added remote API endpoint to trigger translations

This slightly refactors the action class to make the push_translations
method reusable via the API endpoint. It introduces Exception for error
signalling at some points. The overall coding style and architecture has
not been changed, though a bit of refactoring would make future
implementations like this a lot easier.

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