Update to 2.6.4
    
    - Update translations from zanata (cs updated, now 100% complete)
    - Do not crash if initializing enchant or pyhunspell fails,
      continue without spellchecking (Currently, on openSUSE Tumbleweed,
      python3-pyenchant seems broken)
    - Try to install myspell-xx_YY packages instead of hunspell-xx package on SUSE
    - Fix loading of cldr annotations when the .xml files are zipped
    - Add JoyPixels to good_emoji_fonts list