Setting form markup missing translation function

Problem/Motivation

Markup on top of Module settings form is missing translation function

Steps to reproduce

• Setup an Drupal site with (at least) 2 languages installed
• Go to /admin/structure/opigno_module/settings
• See next string on top of form : Settings form for Module entities. Manage field settings here.
• Try to find in /admin/config/regional/translate : no result

Proposed resolution

Update src/Form/OpignoModuleSettingsForm.php to add t() function wrapping this string.
Attached patch does that

Remaining tasks

N/A

User interface changes

N/A

API changes

N/A

Data model changes

N/A