Add tooltip to sign add to all pages feature

[reecebrowne]

Description

Please provide a summary of the changes, including relevant motivation and context.

Closes #()

Checklist

• [X ] I have read the Contribution Guidelines
• [X ] I have performed a self-review of my own code
• [X ] I have attached images of the change if it is UI based
• [X ] I have commented my code, particularly in hard-to-understand areas
• [X ] If my code has heavily changed functionality I have updated relevant docs on Stirling-PDFs doc repo
• [X ] My changes generate no new warnings
• [X ] I have read the section Add New Translation Tags (for new translation tags only)

[Frooodle]

@reecebrowne Now to add this to all elements everywhere on sign haha