Log Message:
mate-menus: update to 1.26.0

Change log:

### mate-menus 1.26.0

  * Translations update
  * update copyright to 2021

### mate-menus 1.25.1

  * Translations update
  * build: remove .directory files using clean target
  * build: allow users to disable gettext support (--disable-nls)
  * Set compiler debug flags / logging with MATE_DEBUG_CHECK
  * build: set GETTEXT_PACKAGE=AC_PACKAGE_NAME
  * Remove -Wconversion -Wsign-compare -Wsign-conversion warnings
  * matemenu-tree: do not call g_settings_get_string unless necessary
  * Improve the description of the collection directory
  * i18n: Add mate-collection.directory.in in POTFILES.in
  * build: Set debug symbols and logging using --enable-debug
  * entry-directories: Use of memory after it is freed (scan-build)
  * matemenu-tree: Fix memory leak
  * matemenu-tree: Remove collection_applet_free
  * Remove the cppcheck warning about the variable scope can be reduced
  * matemenu-tree: minor code format
  * desktop-entries: warning -Wempty-body
  * Remove USE_MATE2_MACROS from autogen.sh (legacy)
  * Add collection menu item

### mate-menus 1.25.0

  * Translations update
  * add git.mk to generate .gitignore
  * build: silent build warnings for distcheck
  * build: do not override the default value for MATE_COMPILE_WARNINGS
  * Do not collect the translation for Icon