[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…)