Translations: Service to track updates on GitHub?

Created by: SecUpwN

While working on #450 (closed) I noticed that we'll likely run into more complaints when not making sure that all translations get updated regularly. Users in other countries with outdated translations will likely have a hard time with our app, especially when string and code changes like in #450 (closed) took place.

Solution: Unless we have found some hardcore maintainers checking each day if changes have been made to our main strings file (which is very unlikely), we should find a service that can:

• Monitor if any strings have been changed on our main strings file
• Highlight on their website which strings on the other translation files need to be updated on GitHub

NOTE: I want to avoid managing our translations externally. Means, all translation files shall stay in our repository, yet an external service should show differences and possibly notify translators. Maybe having another look at #190 (closed) helps us finding such thing? Other suggestions how to handle this are welcome.

@DimaKoz, @agilob and @ph0t0n, please add your opinion here. You may have seen that our main strings file has received a huge number of changes and now you're in the heavy mess I described. Would proposed service make your life easier, or do you have a smarter way of tracking the changes?