Update 'out of storage' banner title and button text

What does this MR do?

It updates the title of the out-of-storage banner and the text of "Manage storage uasge" button according to the UX specs in #276089 (closed).

Note: the 10 KB is a sample data from my local setup, it doesn't represent the value in production.

Screenshots

before	after

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
• Code review guidelines
• Style guides
• Separation of EE specific content

Related to #323968 (closed)