Create a translation key migration script

The script should allow us to migrate a set of translation key from one base translation file to another. It should also create the missing translation files if needed.

Input:

• source_file      Source base translation file
• destination_file Destination base translation file
• key_list         List of keys to migrate

Example:

source_file: xwiki-platform/xwiki-platform-core/xwiki-platform-oldcore/src/main/resources/ApplicationResources.properties

destination_file: xwiki-platform/xwiki-platform-appwithinminutes/xwiki-platform-appwithinminutes-ui/src/main/resources/AppWithinMinutes/Translations.xml

key_list: key_list.txt

where key_list.txt could be:

webprefs
xwikiprefs
attach
attachments
webdaveditattachment
save
delete
preview
copy
login
logout
homepage

This would move the keys of source_file into destination_file and for each translations available (missing translations of the destination should be created).