chore: we don't need to check if the url is valid in upsert screen.

androidApp/src/main/res/values-ko-rKR/strings.xml

@@ -24,7 +24,6 @@
     <string name="all_posts_not_read">"모든 게시물을 읽지 않았습니다."</string>
     <string name="all_posts_read">"모든 게시물을 읽었습니다."</string>
     <string name="undo_string">"실행 취소"</string>
-    <string name="addStringNoUrl">"로그인 소스를 추가 해야 합니다."</string>
     <string name="cant_get_sources">"소스 리스트를 얻을 수 없습니다."</string>
     <string name="cant_create_source">"소스를 만들 수 없습니다."</string>
     <string name="cant_get_spouts_no_network">"Can't get spouts list because of a network issue."</string>
@@ -107,7 +106,6 @@
     <string name="reader_text_align_justify">Justify</string>
     <string name="settings_reader_font">Reader font</string>
     <string name="remove_source">Remove source</string>
-    <string name="pref_theme_title">Light/Dark mode</string>
     <string name="mode_dark">Dark mode</string>
     <string name="mode_system">Follow the system setting</string>
     <string name="mode_light">Light mode</string>