initial translation of Glitch-specific texts into Czech (#1997)

app/javascript/skins/vanilla/contrast/names.yml

@@ -2,6 +2,10 @@ en:
   skins:
     vanilla:
       contrast: High contrast
+cs:
+  skins:
+    vanilla:
+      contrast: Vysoký kontrast
 es:
   skins:
     vanilla:

app/javascript/skins/vanilla/mastodon-light/names.yml

@@ -2,6 +2,10 @@ en:
   skins:
     vanilla:
       mastodon-light: Mastodon (light)
+cs:
+  skins:
+    vanilla:
+      mastodon-light: Mastodon (světlý)
 es:
   skins:
     glitch:

app/javascript/skins/vanilla/win95/names.yml

@@ -2,3 +2,7 @@ en:
   skins:
     vanilla:
       win95: Ｍａｓｔｏ95
+cs:
+  skins:
+    vanilla:
+      win95: Windows 95