Add salary payment in tax module - Link to user.
Necessary for future hrm module.
Add table into script migration && key language
Update langs & fix period for salaries in tax module
Merge branch 'upstream/develop'
Rename "Sal" class into "Salaries"
Use more explicit name for class and functions
Merge branch 'upstream/develop'
Correct Travis Error
Merge pull request #1457 from aspangaro/develop-salary

Add salary payment in tax module