Minor style issues - Admin panel

[KaiserDMC]

Describe the bug

There are a few minor issues within the Administration section related to the Drawer component:

1. Layout Issue: The "Submissions Similarity" text does not fully fit inside the provided space.
2. Spelling Error: The word "similarity" is misspelled with a double "L".
3. Inconsistent Naming: In the main > form > h4 element, the previous spelling error is corrected, however it is now only "Submission" rather than "Submissions" like in the Drawer component. Leading to inconsistent naming.

Steps To Reproduce
Visit: https://alpha.judge.softuni.org/administration/submissions-simillarity

Screenshots

Additional context