* add test
* add change in PretrainedTokenizerBase
* change Luke
* deactivate
* add the possibility to add additional special tokens for M2M100
* format
* add special test for canine
* proposed changes for mbart
* proposed changes for mbart50
* proposed changes for byt5
* proposed changes for canine
* proposed changes for t5
* test fast and slow
* remove comment
* remove comment
* add fast version for all tests
* replace break by continue
* add more comments
* add check to avoid duplicates
* remove comment
* format
* proposed change for wave2vec2
* reverse changes mbart
* uncomment
* format