Replace t() with $this->t() for Drupal 8+ version

I have examined and applied the merge request provided by @Ruslan Piskarov.
The merge request has been successfully implemented.
As a result, 't()' has been replaced with '$this->t()'.
Thank you.

Jay Jangid, your comment doesn't make sense.

You don't have the required access level to apply a merge request to the project (only a project maintainer can do that), and there is no record of anything having been applied.

I think @Jay Jangid wanted to write: he applied the path on local and reviewed.

Well, he might have applies it locally, but there is no real review. He just says that it applies and that it did the edits it were supposed to do. I would not have expected anything less. Whether the module still worked after applying the MR, and if there were any side-effects goes unsaid.

Btw., I appreciate your MR, and hope to find time to test it soon.

Moving to "Fixed".

Automatically closed - issue fixed for 2 weeks with no activity.