Version 3.15.90
---------------

 * More cleanup after the first round of UI modernization
 * Make GAction plugin interface actually usable by plugins
   NOTE: Plugins using the old GtkUIManager interface won't work anymore!

Bug fixes:

 #743887, Image buttons should have tooltips (Felix Riemann)

New and updated translations:

- Marek Černocký [cs]
- Efstathios Iosifidis [el]
- Kristjan SCHMIDT [eo]
- Daniel Mustieles [es]
- Yosef Or Boczko [he]
- Balázs Úr [hu]
- Sveinn í Felli [is]
- Åka Sikrom [nb]
- Rafael Ferreira [pt_BR]
- Stas Solovey [ru]
- Dušan Kazik [sk]
- Daniel Korostil [uk]