More UI fixes and improvements (#2419)

* Unify spelling of confirm exit/retry across apps.
* Unify infrared exit/retry confirm menus?
* "Keyboard Layout", not "Keyboard layout".
* Make iButton read scene prompt less awkward.
* "Detect Reader" in MF Classic saved menu instead of "Detect reader"
* NFC menu spelling changes only.
* Remove \n in strings in widget_add_string_element() calls.

Co-authored-by: あく <alleteam@gmail.com>

applications/main/nfc/scenes/nfc_scene_mf_classic_menu.c

@@ -25,7 +25,7 @@ void nfc_scene_mf_classic_menu_on_enter(void* context) {
     if(!mf_classic_is_card_read(&nfc->dev->dev_data.mf_classic_data)) {
         submenu_add_item(
             submenu,
-            "Detect reader",
+            "Detect Reader",
             SubmenuIndexDetectReader,
             nfc_scene_mf_classic_menu_submenu_callback,
             nfc);