Remove t() calls from tests

Problem/Motivation

We have some calls of t() function in tests. First of all, it's not necessary. Secondly, it generates some CS issues that were reported originally:

FILE: /Users/thallesvf/Desktop/lando/d8-contrib/modules/token/tests/src/Functional/TokenMenuTest.php
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FOUND 20 ERRORS AND 17 WARNINGS AFFECTING 32 LINES
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  10 | WARNING | [x] Unused use statement
  35 | ERROR   | [x] Visibility must be declared on method "testMenuTokens"
  35 | ERROR   | [x] Missing function doc comment
 103 | WARNING | [ ] Line exceeds 80 characters; contains 107 characters
 103 | WARNING | [x] There must be no blank line following an inline comment
 103 | WARNING | [ ] There must be no blank line following an inline comment
 103 | ERROR   | [x] No space found before comment text; expected "// $this->config('menu.entity.node.' . $node->getType())->set('available_menus', ['main-menu'])->save();" but found "//$this->config('menu.entity.node.' .
     |         |     $node->getType())->set('available_menus', ['main-menu'])->save();"
 140 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 157 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 168 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 175 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 177 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 200 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 209 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 233 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 243 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 264 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 291 | ERROR   | [ ] Doc comment short description must be on a single line, further text should be a separate paragraph
 293 | ERROR   | [x] Visibility must be declared on method "testMultilingualMenu"
 332 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 342 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 353 | WARNING | [ ] t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
 383 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 384 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 385 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 386 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 387 | ERROR   | [x] Array closing indentation error, expected 4 spaces but found 6
 414 | ERROR   | [x] Comment indentation error after - element, expected 5 spaces
 414 | ERROR   | [x] Inline comments must end in full-stops, exclamation marks, question marks, colons, or closing parentheses
 424 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 425 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 430 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 431 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 432 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 437 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 438 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 439 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
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PHPCBF CAN FIX THE 21 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Proposed resolution

Get rid of t() calls in tests.