start fix pr 1161 (#1165)

* feat: load configuration from file

* import json config file & update the config (restore)
* export the config and save it to json file (backup)

* fix: reload configuration

* run linter
* screenshot update

* feat: support more langs

* add translations for French, Spanish, and Italian
* change the wording for better understanding of this feature:
    - "import" to "restore"
    - "export" to "backup"
* rename functions to reflect these changes

* i18n.js: german translation

* npm: package updates

* Revert "import & export configuration"

* npm: package updates

* Revert "import & export configuration"

* fix: auto formatter

* Revert "i18n.js: german translation"

This reverts commit e4a7ff08c6c76bf9b1449d520d458be9f57102bc.

* fix conficts

---------

Co-authored-by: Philip H <47042125+pheiduck@users.noreply.github.com>
Co-authored-by: NPM Update Bot <npmupbot@users.noreply.github.com>

src/www/index.html

@@ -108,7 +108,7 @@
                 </svg>
                 <span class="text-sm">{{$t("restore")}}</span>
                 <input id="inputRC" type="file" name="configurationfile" accept="text/*,.json" @change="restoreConfig"
-                  class="hidden -z-[1]" />
+                  class="hidden" />
               </label>
               <!-- Backup configuration -->
               <a href="./api/wireguard/backup" :title="$t('titleBackupConfig')"