Create one library project, the logic project.
Then, create a project by each language with have the library project.
Other form is use any VCS, as GIT, and create a brach for each language.
EDIT:
Library projects:
If the logic is the library project, you can create the apks directly from language projects.
But I don't know if you need "dummy files" in logic project for references.
SVC:
You create the master (principal) brach for english (for example). After, you create a new branch "spanish". In this branch, you reemplace the english files by spanish files.
If you need modify the logic, back to master branch, modify the files, change to spanish branch and merge the changes. The merge only modify the lines changed in master and hold the spanish files.