Log Message:
mate-control-center: Update to 1.21.2:

### mate-control-center 1.21.2

  * Translations update
  * require mate-settings-daemon-1.21.2
  * keybindings: Add a key binding to toggle the microphone's mute status
  * keybindings: Add some key bindings to control volume quietly
  * Account for NULL error when we see G_IO_STATUS_EOF
  * typing-break: replace deprecated gdk_error_trap functions
  * tx: update translation sources
  * update hint for mouse double-click
  * keybindings: double click instead one click to edit keyboard shortcuts
  * mate-keybinding-properties: avoid deprecated 'gtk_widget_ensure_style'
  * added search option for mate-font-viewer
  * Load avatar-default as default image
  * for accounts service support
  * keybindings: Add a key binding to launch settings
  * Depend on mate-desktop 1.21.2 due to new gschema key
  * Fix spelling and grammar mistakes
  * update legal.xml
  * Use make functions for HELP_LINGUAS
  * tx: add m-c-c user-guide to transifex config
  * Add UI to control org.mate.accessibility-keyboard.stickykeys-latch-to-lock
  * use fixed size to show user icon
  * Add new api for EImageChooser
  * get/set user face icon use accounts service

### mate-control-center 1.21.1

  * Translations update
  * require mate-desktop-1.21.1
  * typing-break: Make images larger and load as surface
  * Mouse: include a toggle to enable or disable middlemouse paste
  * capplets/keybindings: avoid deprecated 'gdk_keymap_get_default'
  * display-capplet.ui: replace deprecations
  * libslab: code clean up
  * wm-common: replace deprecated gdk_error_trap functions
  * libslab: replace deprecated gtk_menu_popup
  * msd-input-helper: replace deprecated gdk_error_trap functions
  * mouse: replace deprecated gdk_error_trap functions

### mate-control-center 1.21.0

  * Translations update
  * update mate-control-center.pot
  * bump required version of mate-menus
  * use new mate-menus api
  * use new api
  * use matemenu_tree_new
  * appearance: fixed more indents
  * appearance: fixed indentations
  * appearance: add buttons-have-icons switch
  * mouse: add middle button emulation switch
  * display-capplet: add css name for scrollarea
  * Change cursor-size to 24px
  * Scale cursor size for HiDPI when changing themes
  * Fix screen geometry to account for rotation when snapping.
  * Add auto-detect toggle switch
  * theme-util.c: fix segfault on attempt to delete custom theme
  * theme-thumbnail.c: avoid deprecated GtkButton:use-stock
  * avoid deprecated GtkStock
  * Remove useless parameter in mate_theme_install_real
  * theme-installer.c: add tips when reinstall a existed theme