When user create own landing page block with a long name (approximately > 20 characters) this name doesn't fit inside block area.

Steps to reproduce
1. Create clean installation of eZ Platform v1.13.
2. Create own landing page block e.g. by following instructions from documentation: https://doc.ezplatform.com/en/2.0/guide/content_rendering/#landing-page-blocks
3. Visit landing page editor.
4. Hit "Edit"
5. Expand "Elements" section.
6. The result: name of the block overflows the block area.

Example use case is presented on a screenshot attached to this ticket.