Fix various issues on shared hosting

[respencer]

Description & Issue number it closes

• Fix mod_rewrite detection on shared hosting
• Fix formatting of apache_get_modules notice
• Make said notice easier to translate
• Add more gettext fields
• Clean up
• Attempt to exclude .htaccess from change validation (it frequently needs to be changed on shared hosting)

Resolves #7056

Screenshots (if appropriate)

How to test the changes?

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[DAcodedBEAT]

Can we use a structured object instead of a generic stdclass?

[respencer]

Unfortunately I don't know what exactly you want here instead.

[DAcodedBEAT]

Instead of using \stdClass, we should make a new IntegrityCheckResults class with all of the expected fields. Right now, any field can be added to this plain stdclass and each of it's properties are undocumented, which makes it difficult to see what is being used and where.

[DAcodedBEAT]

(we can defer this change if you want but if we do, can you make a Github issue for tracking?)