fix(settings): Clarify peculiarities of enabling encryption

[susnux]

• Resolves enh(Settings): Provide visual feedback to user when encryption app not installed. #48829

Summary

• Clarify that enabling server side encryption will not encrypt existing files but only new or changed files.
• Clarify that server side encryption can only be disabled using OCC
• Ensure there is accessible information of encryption state (disabled input will not be announced so make it aria-disabled instead)
• Make warning more prominent by moving it into a dialog

Screenshots

before	after

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[susnux]

/backport to stable31

[joshtrichards]

Related:

#40468
#48829
#49200

[susnux]

/compile

[szaimen]

Tested and LGTM so far but did not review the code.

However shouldnt we check the following requirement before we allow to enable the SSE?
(This hint is only displayed after the SSE was activated)

[susnux]

However shouldnt we check the following requirement before we allow to enable the SSE?

Makes sense ✅

[szaimen]

Tested again and LGTM

Just as an idea: we could even disable the switch to enable SSE if the encryption module is not enabled, no?

[susnux]

/backport to stable30

[susnux]

/backport to stable29

[backportbot]

The backport to stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/50424/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick cdaeb638 78bec6f4

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/50424/stable29

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable30 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable30
git pull origin stable30

# Create the new backport branch
git checkout -b backport/50424/stable30

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick cdaeb638 78bec6f4

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/50424/stable30

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[susnux]

/backport cdaeb63 to stable30

[susnux]

/backport cdaeb63 to stable29

[backportbot]

The backport to stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/50424/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick cdaeb638

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/50424/stable29

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable30 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable30
git pull origin stable30

# Create the new backport branch
git checkout -b backport/50424/stable30

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick cdaeb638

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/50424/stable30

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.