Keep the unused strings.

Author: okonomiyaki3000

administrator/language/en-GB/en-GB.plg_editors_codemirror.ini

@@ -11,6 +11,9 @@ PLG_CODEMIRROR_FIELD_AUTOCLOSEBRACKET_DESC="Automatic bracket completion."
 PLG_CODEMIRROR_FIELD_AUTOCLOSEBRACKET_LABEL="Bracket Completion"
 PLG_CODEMIRROR_FIELD_AUTOCLOSETAGS_DESC="Automatic tag completion."
 PLG_CODEMIRROR_FIELD_AUTOCLOSETAGS_LABEL="Tag Completion"
+; The following two strings are deprecated and will be removed in J4
+PLG_CODEMIRROR_FIELD_AUTOFOCUS_DESC="Auto focus."
+PLG_CODEMIRROR_FIELD_AUTOFOCUS_LABEL="Auto Focus"
 PLG_CODEMIRROR_FIELD_CODEFOLDING_DESC="Allow blocks of code to be folded."
 PLG_CODEMIRROR_FIELD_CODEFOLDING_LABEL="Code Folding"
 PLG_CODEMIRROR_FIELD_FONT_FAMILY_DESC="The font to use in the editor. If not installed, will be loaded from https://www.google.com/fonts/."