[tests] compare languages

[TorstenDittmann]

I would really like to have a test job, that compares the language files and displays the coverage of them compared to the English one.

This should probably be added as an npm script.

[gustavohleal]

Taking this one \o

[TorstenDittmann]

Nice 😄

So basically every JSON file in here should be compared to the en.json.

The output should be something like this:

de: 100%
pt: 100%
ru: 96%
Missing the following keys:
 - write.editor.title
 - settings.fontSize.title
nl: 100%

If possible, I would like to avoid any dependencies for this and you can place a node.js script for this in here.

If you have any questions, feel free to ask 👍