Here is my values\\strings.xml (the default file) and everything is self explanatory:
My question(s):
I've created a tool to manage the translation status of android apps. It not only tells you what strings are missing on the other languages, but it can also report, and clean the left over strings that you may have deleted on your default translation file.
https://github.com/gubatron/android-missing-strings
To clean all left overs in other languages invoke like this
./ams --cleanleftovers -o all.txt
This will clean the left over strings and it will output the missing strings report for all the languages into the all.txt file