remove unused messages
Merge branch 'master' of github.com:ornicar/lila

* 'master' of github.com:ornicar/lila:
  Update messages
upgrade chess module
boring commit.
ka "ქართულ" translation #6395. Author: beqa.
tr "Türkçe" translation #6396. Author: Slonmaster.
ko "한국어" translation #6398. Author: Deep_two.
hi "हिन्दी, हिंदी" translation #6399. Author: nihal16.
es "español, castellano" translation #6400. Author: serpaz.
sl "slovenščina" translation #6402. Author: MihaSLOVE.
sl "slovenščina" translation #6403. Author: MihaSLOVE.
th "ไทย" translation #6404. Author: Yodyoy. แก้ไขที่ผิดเล้กน้อย
hy "Հայերեն" translation #6405. Author: citizensas.
sk "slovenčina" translation #6406. Author: japetko.
sr "Српски језик" translation #6408. Author: Jaksha.
ru "русский язык" translation #6409. Author: A12.
ka "ქართულ" translation #6410. Author: datokaza.
ka "ქართულ" translation #6412. Author: levan.
hy "Հայերեն" translation #6414. Author: artavetis.
hu "Magyar" translation #6416. Author: hiperkarma. I've made some tiny changes, typo-fixes. Some translations weren't accurate enough, now its clearer.