Update strings.xml

Author: artdeell

app/src/main/res/values/strings.xml

@@ -35,7 +35,7 @@
 
 	<!-- Hint -->
 	<string name="hint_select_account">To select, click it. To delete an account, hold it.</string>
-	<string name="hint_control_mapping">"This feature is not yet finished so can't apply custom control at the moment!\nSwipe from right to left to open menu ◀\nHold a button to customize: edit, resize or delete."</string>
+	<string name="hint_control_mapping">"This feature is not yet finished so can\'t apply custom control at the moment!\nSwipe from right to left to open menu ◀\nHold a button to customize: edit, resize or delete."</string>
 
 	<!-- Warning -->
 	<string name="warning_title">Warning</string>