Motivation
Currently the test servers do not have a version fixing the latest bug in wikidiff2. (T197157)
Suggestion:
- Update the mobile server to wikidiff 1.7.3 so the beforementioned bugs can be validated as fixed.
- On the main page table, replace the "new" and "old" column headers by the version numbers they actually reflect.
- add a third column with the mobile version (called its corresponding version number)