Delete unused string

(cherry picked from commit 8791c3e45cc16ffd5f564e789e826b689201952b)

FreeAPS/Sources/Localizations/Main/en.lproj/Localizable.strings

@@ -1166,9 +1166,6 @@ Enact a temp Basal or a temp target */
 "Normal " = "Normal ";
 
 /* */
-"Add / Delete" = "Add / Delete";
-
-/* */
 "Currently no Override active" = "Currently no Override active";
 
 /* */