github action to track missing translation

[rperon]

Feedback from @fredericrous:

Nice to have final feature: a github action that checks there are no missing translation (some in the code but not in the translation json file)

This might be done by using i18n-parser, need some investigation to find the right solution.

[fredericrous]

yup, I was thinking of comparing the output of i18n-parser with the version file.
a very basic implem could be:

• load the output with something like Object.keys(result)
• if there are more keys in the code than in the translation files
• loop over to find which are the missing keys with something like output.filter(x => translation['en].includes(x));
• do the opposite to know if there are keys in the translation files that are not in the code

Update: also the action should fail if there is a duplicated key in the same file!