Add Serbian translation and update translations

UI/Contacts/English.lproj/Localizable.strings

@@ -249,4 +249,13 @@
 "Sucessfully subscribed to address book" = "Sucessfully subscribed to address book";
 
 /* Aria label for scope of search on contacts */
-"Search scope" = "Search scope";
+"Search scope" = "Search scope";
+
+/* Aria label for avatar button to select and unselect a card */
+"Toggle item" = "Toggle item";
+
+/* Hotkey to create a new card */
+"key_create_card" = "c";
+
+/* Hotkey to create a new list */
+"key_create_list" = "l";