MOBILE-3153 lang: Remove placeholders from strings
MOBILE-3153 lang: Remove placeholders from strings

This is necessary because we started using strings with placeholders that the app doesn't interpret, in particular the ones in user tours: https://github.com/moodle/moodle/blob/7ff6b2daef613b5c1ee73fa25b394288a82f6d4e/admin%2Ftool%2Fusertours%2Flang%2Fen%2Ftool_usertours.php#L274

reskit/moodlemobile,reskit/moodlemobile,reskit/moodlemobile,reskit/moodlemobile,reskit/moodlemobile,reskit/moodlemobile