Ext storage error warning fix

[skjnldsv]

Fix#8363

[juliusknorr]

The message here doesn't make much sense. It is shown, for personal external storage settings and if the administrator disabled the possibility to configure external storages in the personal settings there is nothing users can do about that. Also the link to admin/externalstorages only makes sense for admins.

[juliusknorr]

Maybe it should be something like: "You cannot configure external storages, since it has been disabled by the administrator"

[skjnldsv]

@juliushaertl It's not only about disabled by the admin, if you're the admin but you did not set up one at the moment, the page is still empty :)

"No external storage configured or you don't have the permission to configure them"

[juliusknorr]

Fine by me, better than referring to personal settings when you are on personal settings 😉

[codecov]

Codecov Report

Merging #8511 into master will decrease coverage by 1.68%.
The diff coverage is 0%.

@@ Coverage Diff @@## master #8511 +/- ##
============================================
- Coverage 53.49% 51.81% -1.69% - Complexity 24076 25375 +1299 
============================================
Files 1443 1601 +158 Lines 80512 95041 +14529 Branches 0 1377 +1377 ============================================
+ Hits 43067 49241 +6174 - Misses 37445 45800 +8355

Impacted Files	Coverage Δ	Complexity Δ
apps/files_external/templates/list.php	0% <ø> (ø)	0 <0> (?)
apps/files_external/templates/settings.php	0% <0%> (ø)	0 <0> (?)
apps/files_external/js/settings.js	58.49% <0%> (ø)	0 <0> (?)
.../tests/Unit/Collaboration/CommentersSorterTest.php	25.55% <0%> (-66.45%)	6% <0%> (ø)
apps/sharebymail/tests/SettingsTest.php	52.17% <0%> (-47.83%)	3% <0%> (ø)
lib/private/Security/RateLimiting/Limiter.php	55.55% <0%> (-44.45%)	5% <0%> (ø)
settings/Controller/EncryptionController.php	54.71% <0%> (-38.84%)	8% <0%> (ø)
settings/Controller/GroupsController.php	64.61% <0%> (-35.39%)	9% <0%> (ø)
...b/private/App/AppStore/Fetcher/CategoryFetcher.php	69.23% <0%> (-30.77%)	1% <0%> (ø)
...ps/comments/tests/Unit/AppInfo/ApplicationTest.php	69.56% <0%> (-30.44%)	4% <0%> (ø)
... and 349 more

Edited. Please update review :)

[MorrisJobke]

Tested and works 👍

[skjnldsv]

backport in #8561