[request] add script to find missing translations in a locale

[n-riesco]

What I have in mind is:

• build a list of strings to translate by running grep under srcto find occurrances of _(gd, 'a string to translate')
• load a locale, e.g. lib/locales/es.js, and find any missing strings in exports.dictionary.

[alexcjohnson]

Good call @n-riesco - the first part we have (npm run find-strings, it's part of the build process too, so translation-keys.txt is updated with every new release) but we don't have a way to compare that to existing translations and see what's missing, that would be really nice to have.

[alexcjohnson]

As shown in #4612 we also have some incorrect keys - that's something we can include a CI test for, since we'll generally either be able to figure out the right key or we can just delete it. Missing keys though we won't generally be able to fix without a native speaker to help, so that's probably not a good idea to run on CI.

[gvwilson]

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson