Correct research of predicted entity beginning

The first letter of predicted entity was missing in some cases.

requested review from @kermorvant

By Blanche Miret on 2021-06-01T16:52:56 (imported from GitLab)

assigned to @b_miret

By Blanche Miret on 2021-06-01T16:52:56 (imported from GitLab)

added 1 commit

• 0a216a31 - Add test for entity boundaries

Compare with previous version

By Blanche Miret on 2021-06-01T18:39:17 (imported from GitLab)

mentioned in commit 5af16c98

merged