slash in title leads to error

**Steps to reproduce**

- insert "test/123" into title field
- press start

**expected behaviour**

time tracker started with "test/123" as title

**actual behaviour**

tries to connect to "/apps/timetracker/ajax/start-timer/test/123"
alert shown with content "error", "Connection to server lost" message in the upper right corner

**possible solution**

implement escaping