Update to 1.12.5
    
    - Return False in _execute_command_commit_candidate_number(self, number)
      if number out of range
    - Resolves: https://github.com/moebiuscurve/ibus-table-others/issues/21
    - remove Use-from-unittest-import-mock-instead-of-just-import.patch
      (included upstream)
    - Update translations from Weblate (New translation for Sinhala (si) started)