Fix bug where resource was not able to get updated settings in the current instance

Note: Implementation is currently buggy. Settings are saved, but accessible only on restarting the agent instance.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

This will make the EteSync icon show up while selecting a new resource

Akonadi was fixed (reverted it)

Revert ok'ed by David

CCMAIL: faure@kde.org

This reverts commit 477c7247.

CCMAIL: dvratil@kde.org

This will get all contacts in the address books

This makes address books show up in Kontact

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

According the i18ncp signature, the singular form comes first
after the context, followed by the plural form.
Fix the order in a few i18ncp calls.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

Summary:
When user adds new maildir, a new resource gets created, with the default
directory `~/.local/share/local-mail`. Since it's a new resource, with no
proper configuration, an `attemptConfigRestoring()` is called, which changes
it to `~/.local/share/akonadi_maildir_resource#`. It's stored inside
`mSettings->path()`.

Then a dialog appears, where user can choose prefered directory. It gets
written to the config file; then `configurationChanged` gets called.
We call `mSettings->save()`, which overwrites the path provided by user with
the default one (`~/.local/share/akonadi_maildir_resource#`), making it
impossible to create a new maildir anywhere else.

Just use `load()` instead, it makes more sense when configuration was changed.

BUG: 416287
CCBUG: 415245
CCBUG: 415922

Test Plan:
1) Create a new maildir resource pointing to `/tmp/dummy`.
2) The resource gets created, with the name `dummy`. `/tmp/dummy` gets created.
2) Drop some mails into it via KMail. Mails appear inside `/tmp/dummy`

Reviewers: dvratil, mlaurent

Reviewed By: dvratil

Subscribers: wbauer, kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D27905

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"