Fix: Remove nl2br() causing repeated <br /> tag accumulation in UI footer

[Copilot]

Contribution Guidelines

• I've read the contribution guidelines and wholeheartedly agree them

What does this PR include?

Short Description

The UI footer field accumulated <br /> tags on each save due to nl2br() converting newlines during display while persisting the converted HTML. Removed the conversion—users control their own HTML in a field labeled "HTML allowed".

Before:

1. Load: nl2br() converts \n → <br />
2. Display in textarea: shows Line 1<br />
3. Save: stores Line 1<br /> to Redis
4. Next load: nl2br() converts to Line 1<br /><br />

After:
Content flows through unchanged. Users add <br> tags explicitly if needed.

Affected Containers

• web (PHP)

Did you run tests?

What did you tested?

• PHP syntax validation
• Code review (automated)
• CodeQL security scan

What were the final results? (Awaited, got)

All validation passed. No security issues introduced. Existing footer content with accumulated tags remains stable but won't accumulate further.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Newlines repeatedly added to UI Footer on save</issue_title>
<issue_description>### Contribution guidelines

• I've read the contribution guidelines and wholeheartedly agree

Checklist prior issue creation

• I understand that failure to follow below instructions may cause this issue to be closed.
• I understand that vague, incomplete or inaccurate information may cause this issue to be closed.
• I understand that this form is intended solely for reporting software bugs and not for support-related inquiries.
• I understand that all responses are voluntary and community-driven, and do not constitute commercial support.
• I confirm that I have reviewed previous issues to ensure this matter has not already been addressed.
• I confirm that my environment meets all prerequisite requirements as specified in the official documentation.

Description

Every time the UI footer html is saved, the backend adds <br /> at the end of every line. This modified version is now the new content. When clicking save again, it will add <br />s again. This is incredibly annoying, especially if you just want to edit one of the other inputs that share the same submit button (eg. Announcement text).

Steps to reproduce:

1. Log in as admin
2. Go to System > Configuration > Options > Customize
3. At the bottom of the page, enter mutiple lines into Footer (HTML allowed):
4. Save
5. Note that <br />s have been added to the end of every line
6. Save again
7. Note that another set of <br />s has been added

Initial input:

After 1st save:

After 2nd save:

After 3rd save:

Which branch are you using?

master (stable)

mailcow version:

2025-09c
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Newlines repeatedly added to UI Footer on save #6833

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