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

androidApp/src/main/res/values-zh-rTW/strings.xml

@@ -24,7 +24,6 @@
     <string name="all_posts_not_read">"所有帖子都未读"</string>
     <string name="all_posts_read">"所有帖子已读"</string>
     <string name="undo_string">"撤销"</string>
-    <string name="addStringNoUrl">"登录以添加数据源。"</string>
     <string name="cant_get_sources">"无法获取数据列表。"</string>
     <string name="cant_create_source">"无法创建源数据。"</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>