one.edee:babylon-maven-plugin (maven):  Babylon is a tool to gather messages, and their translations from property files. It performs a round-trip consisting of two phases: export phase and import phase. In the export phase the messages are written to a Google Sheets spreadsheet. A translator will then fill in the missing translations. In the import phase, the spreadsheet (with the missing translations filled out by a translator) is examined, and the newly translated messages are used to update the respective translation property files. Also, the state of the translation, snapshot, is written out to a disk in the form of JSON file. Babylon can be run as a Maven plugin or as a standalone console application. 
Keywords: google-spreadsheet-api|java|localization-tool|maven-plugin|translation-tool