Overview of changes in 3.19.4
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* Support saturation adjustment

* Bugs fixed:
 746940 preview-nav-buttons: Crashes if shutdown and fade_out_button coincide
 759155 tool-colors: Restrict the range of the brightness slider
 759156 application, base-item: Preserve metadata when saving
 759331 Don't show empty albums in favorites
 759363 Explicit exports functionality with more options
 759521 application: Adapt to Grilo 0.3.0 API changes
 760865 theme: Don't use deprecated pseudo classes

* Updated translations:
 Czech
 Finnish
 German
 Hebrew
 Lithuanian
 Norwegian bokmål
 Portuguese (Brazilian)
 Slovak
 Spanish