Interactive maps messages review

This pull request was created only for message review purposes. Do not merge it!

Dear ComEng developers: pick red or green background to review the messages and their documentation, please :)

Once you finish review and we address all found issues we'll be able to delete the branch.
"If it repeats" isn't clear wording. This would be better as something like: "Oops, we are currently having issues with our maps service. If the error persists, please [[Special:Contact|contact us]].", or possibly finishing with "Please wait a while and try again. If the error persists, please [[Special:Contact|let us know]]." instead.