account_archive: unify archive file type

When creating an account archive, there would be no default
suffix. Then, when importing the archives, we would filter
for .gz files by name. The goal is to implement a .jami
file extension for archives across all platforms.

Todo: implement custom MIME type for custom icons.

GitLab: #1256
Change-Id: I202ae5670c928f35b0eaf711abf7249ec3f304b9

src/app/mainview/components/BackupTipBox.qml

@@ -119,7 +119,8 @@ Item {
                             "title": JamiStrings.backupAccountHere,
                             "fileMode": JamiFileDialog.SaveFile,
                             "folder": StandardPaths.writableLocation(StandardPaths.HomeLocation) + "/Desktop",
-                            "nameFilters": [JamiStrings.jamiArchiveFiles, JamiStrings.allFiles]
+                            "nameFilters": [JamiStrings.jamiAccountFiles, JamiStrings.allFiles],
+                            "defaultSuffix": ".jac"
                         });
                     dlg.fileAccepted.connect(function (file) {
                             // Is there password? If so, go to password dialog, else, go to following directly

src/app/net/jami/Constants/JamiStrings.qml

@@ -216,7 +216,7 @@ Item {
     property string backupAccountBtn: qsTr("Back up account")
     property string success: qsTr("Success")
     property string error: qsTr("Error")
-    property string jamiArchiveFiles: qsTr("Jami archive files (*.gz)")
+    property string jamiAccountFiles: qsTr("Jami account (*.jac)")
     property string allFiles: qsTr("All files (*)")
 
     // ContactItemDelegate

src/app/settingsview/components/ManageAccountPage.qml

@@ -349,8 +349,9 @@ SettingsPageBase {
                             "title": JamiStrings.backupAccountHere,
                             "fileMode": FileDialog.SaveFile,
                             "folder": StandardPaths.writableLocation(StandardPaths.DesktopLocation),
-                            "nameFilters": [JamiStrings.jamiArchiveFiles, JamiStrings.allFiles]
-                        });
+                            "nameFilters": [JamiStrings.jamiAccountFiles, JamiStrings.allFiles],
+                            "defaultSuffix": ".jac"
+                        })
                     dlg.fileAccepted.connect(function (file) {
                             // is there password? If so, go to password dialog, else, go to following directly
                             var exportPath = UtilsAdapter.getAbsPath(file.toString());

src/app/wizardview/components/ImportFromBackupPage.qml

@@ -133,7 +133,7 @@ Rectangle {
                         "title": JamiStrings.openFile,
                         "fileMode": JamiFileDialog.OpenFile,
                         "folder": StandardPaths.writableLocation(StandardPaths.HomeLocation) + "/Desktop",
-                        "nameFilters": [JamiStrings.jamiArchiveFiles, JamiStrings.allFiles]
+                        "nameFilters": [JamiStrings.jamiAccountFiles, JamiStrings.allFiles]
                     });
                 dlg.fileAccepted.connect(function (file) {
                         filePath = file;