[stable13] add privacy link to theming and fix scrollbars

[blizzz]

solves #9577

needs a forward port to master afterwards. For reasons it's against stable13 :)

@skjnldsv@juliushaertl is the second commit reasonable?

[skjnldsv]

It make sense to me. But Julius is better fitted for his opinion on this since he's the manager of theming :)

[codecov]

Codecov Report

Merging #9586 into stable13 will decrease coverage by 18.24%.
The diff coverage is 0%.

@@ Coverage Diff @@## stable13 #9586 +/- ##
===============================================
- Coverage 50.87% 32.62% -18.25% - Complexity 25089 25096 +7 
===============================================
Files 1547 1547 Lines 87689 87717 +28 ===============================================
- Hits 44608 28617 -15991 - Misses 43081 59100 +16019

Impacted Files	Coverage Δ	Complexity Δ
apps/theming/lib/Settings/Admin.php	13.15% <0%> (-73.33%)	5 <0> (ø)
apps/theming/lib/Controller/ThemingController.php	4.25% <0%> (-68.91%)	47 <0> (+2)
apps/theming/lib/ThemingDefaults.php	18.06% <0%> (-74.19%)	54 <1> (+5)
apps/theming/templates/settings-admin.php	0% <0%> (ø)	0 <0> (ø)	⬇️
...ddleware/Security/Exceptions/NotAdminException.php	0% <0%> (-100%)	1% <0%> (ø)
apps/dav/lib/CalDAV/Activity/Filter/Todo.php	0% <0%> (-100%)	7% <0%> (ø)
...pFramework/Db/MultipleObjectsReturnedException.php	0% <0%> (-100%)	1% <0%> (ø)
lib/private/Files/ObjectStore/Mapper.php	0% <0%> (-100%)	2% <0%> (ø)
core/Command/TwoFactorAuth/Enable.php	0% <0%> (-100%)	4% <0%> (ø)
...te/Authentication/LoginCredentials/Credentials.php	0% <0%> (-100%)	4% <0%> (ø)
... and 527 more

[juliusknorr]

Makes sense and works fine 👍

[MorrisJobke]

@blizzz Please open the forward port.

[blizzz]

i do another theming release first, while i am already in that fashion 🚢 🚢 🚢

(if appstore would not run into timeout…)