lang: Drop all deprecated strings, and rename LANG__NEVER to LANG_NEVER

Change-Id: Ie1a1cb04ecb566b75d9884b98a8c4e37a4e8736f

apps/lang/korean.lang

@@ -7059,40 +7059,6 @@
     *: ""
   </voice>
 </phrase>
-<phrase>
-  id: LANG_BACKDROP_LOADED
-  desc: deprecated
-  user: core
-  <source>
-    *: none
-    lcd_non-mono: ""
-  </source>
-  <dest>
-    *: none
-    lcd_non-mono: ""
-  </dest>
-  <voice>
-    *: none
-    lcd_non-mono: ""
-  </voice>
-</phrase>
-<phrase>
-  id: LANG_BACKDROP_FAILED
-  desc: deprecated
-  user: core
-  <source>
-    *: none
-    lcd_non-mono: ""
-  </source>
-  <dest>
-    *: none
-    lcd_non-mono: ""
-  </dest>
-  <voice>
-    *: none
-    lcd_non-mono: ""
-  </voice>
-</phrase>
 <phrase>
   id: LANG_KEYBOARD_LOADED
   desc: shown when a keyboard has been loaded from the dir browser
@@ -7360,23 +7326,6 @@
     radio: "설정을 찾지 못했습니다. 자동 검색을 할까요?"
   </voice>
 </phrase>
-<phrase>
-  id: LANG_FM_SAVE_CHANGES
-  desc: deprecated
-  user: core
-  <source>
-    *: none
-    radio: ""
-  </source>
-  <dest>
-    *: none
-    radio: ""
-  </dest>
-  <voice>
-    *: none
-    radio: ""
-  </voice>
-</phrase>
 <phrase>
   id: LANG_CROSSFEED_DIRECT_GAIN
   desc: in crossfeed settings