Release 4.15.1

[merkushin]

• Replace next version tag
• Update plugin version
• Update chaneglog
• Update translations

[github-actions]

Please perform the following tests with the built package in a new installation before publishing:

• Check that the installed version is correct on the Plugins page.
• Create and publish a course, a module, and a lesson to the course.
• Enable the learning mode in the course.
• Log in with a user and complete the course.
• Visit Students in admin and observe that the user is displayed with the course completed.
• Disable learning mode in the course.
• Visit the course again to make sure that it displayed correctly.

[codecov]

Codecov Report

Merging #6987 (79cb1b5) into trunk (240cd17) will not change coverage.
The diff coverage is n/a.

❗ Current head 79cb1b5 differs from pull request most recent head 3410d49. Consider uploading reports for the commit 3410d49 to get more accurate results

@@            Coverage Diff            @@
##              trunk    #6987   +/-   ##
=========================================
  Coverage     46.70%   46.70%           
  Complexity    10224    10224           
=========================================
  Files           568      568           
  Lines         36856    36856           
  Branches        401      401           
=========================================
  Hits          17213    17213           
  Misses        19317    19317           
  Partials        326      326           

Impacted Files	Coverage Δ
.../emails/generators/class-course-teachers-trait.php	100.00% <ø> (ø)
...ass-sensei-reports-overview-list-table-courses.php	48.71% <ø> (ø)
.../class-sensei-reports-overview-service-courses.php	75.26% <ø> (ø)

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[donnapep]

@merkushin I noticed this PR has no change log but I think that's a mistake. It should have one so we should add it to the change log.