[FEATURE] Add action to check source strings

[jesmrec]

Two actions were addressed here:

• In the strings.xml file, some tiny changes to normalize the file against the validation script: remove some useless line breaks, and replace " for the escaped \"

• The action will run a script to check if every string in strings.xml contains any forbidden character (non-escaped). The list of forbidden characters is set inside the script (i expect the list to be very static). The util xmlstarlet will be used to parse the xml file and provide every entry one by one by using the process substitution operation

For the moment, the check will not be mandatory. Let's give a try, and, if it works fine, we could become mandatory

Related Issues

App:

• Add changelog files for the fixed issues in folder changelog/unreleased. More info here
• Add feature to Release Notes in ReleaseNotesViewModel.kt creating a new ReleaseNote() with String resources (if required)

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QA