Hi Ludo,
I've been through the en_utf8 lang file very carefully now...
I've added in LOTS of translations for the variables missing from the last release. Some you may have patched by your team since that time. I've also made a few more corrections to existing ones.
In both cases there were a few variables that I chose not to translate because it wasn't clear to me what the applicable functionality for what was being labelled. I've indicated this in the file clearly.
Finally, I've also gone through all the existing string variable key names and looked for misspellings or lack of clarity and made suggestions where appropriate. I appreciate that making changes to actual key lookup names is slightly more work for your team. I got the impression that all key names have to be in English so I can sympathise with your team for any errors that may have cropped in. They are only suggestions and don't have to be followed, besides, they wouldn't be seen by any users of the wiki unless they dig inside your code!
All edits to the file by me are at the top of the file, but I can tidy it up in to something sensible for you if you can help with clarification on the functionality of those I didn't understand.
Please see attached and I hope you don't think too many of my changes are too pedantic

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Best wishes,
Stuart.