Command scan-for-all-undefined-stringtable-keys to check all files for undefined stringtable-keys and present them in a special view that also has the ability to save this data in multiple formats.
Command convert-to-stringtable-key to convert a selected string to a stringtable key. This puts the string into the Stringtable.xml-file and also replaces the string in the original file with a translate + the new stringtable-key.
Command insert-stringtable-key to create a new stringtable-key in the Stringtable.xml-file. This is also available as Quick fix when encountering undefined stringtable-keys.