Usage of deprecated core strings

[opitz]

SInce Moodle 4.3 some core _completion strings have been deprecated.
Using them will result in a warning:

String [completionview,core_completion] is deprecated. Either you should no longer be using that string, or the string has been incorrectly deprecated, in which case you should report this as a bug. Please refer to https://moodledev.io/general/projects/api/string-deprecation

String [completionusegrade_help,core_completion] is deprecated. Either you should no longer be using that string, or the string has been incorrectly deprecated, in which case you should report this as a bug. Please refer to https://moodledev.io/general/projects/api/string-deprecation