3.21.1 - 2016/09/18

New Features:
  * Shell search provider will search only in note titles (#765894)
  * Change accelerator for Back button to <Ctrl>,

Fixes:
  * Fix build against Glibmm 2.21 (#770541)
  * Fix memory leak in TrieTree (#770056)

Translations:
  * Updated translations:
    - Catalan (ca)
    - Czech (cs)
    - Hungarian (hu)
    - Polish (pl)
    - Serbian (sr, sr@latin)
    - Spanish (es)
    - Swedish (sv)
  * Updated Hungarian manual (hu)