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.
The abbreviation for "for example" in English is "e.g.", not "ex." https://en.wikipedia.org/wiki/E.g.#e.g.