- Added to main menu possibility to export and import all application date.

- Improved encryption/decryption of exported/imported data.  If accounts
  were exported, they need to be exported again.
- Lots of other implemetation improvements.

app/src/main/res/values/strings.xml

@@ -103,10 +103,9 @@
     Check Apps → baresip → Permissions → Storage."
     </string>
     <string name="import_accounts">Import</string>
-    <string name="imported_accounts">Imported accounts from Download folder.  You need to restart
-        baresip.</string>
+    <string name="imported_accounts">Accounts imported.  You need to restart baresip.</string>
     <string name="import_accounts_error">Failed to import accounts from Download folder file.
-Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\' exists in
+        Check Apps → baresip → Permissions → Storage and that exported file \'accounts.bs\' exists in
         the folder and, if so, you gave correct Decrypt Password."
     </string>
     <string name="delete_account">Do you want to delete account \'%1$s\'?</string>
@@ -195,7 +194,8 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
         Valid values are 6000-510000. Factory default is 28000.</string>
     <string name="_28000" translatable="false">28000</string>
     <string name="opus_packet_loss">Expected Opus packet-loss</string>
-    <string name="opus_packet_loss_help">Expected Opus audio stream packet loss percentage, from 0-100. By default 0, turning off Opus Forward Error Correction (FEC).</string>
+    <string name="opus_packet_loss_help">Expected Opus audio stream packet loss percentage,
+        from 0–100. By default 0, turning off Opus Forward Error Correction (FEC).</string>
     <string name="_0" translatable="false">0</string>
     <string name="invalid_opus_bitrate">Invalid Opus bitrate</string>
     <string name="invalid_opus_packet_loss">Invalid Opus Packet Loss Percentage</string>
@@ -230,7 +230,7 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
     <string name="exported_contacts">Exported contacts to Download folder file \'contacts.bs\'.</string>
     <string name="export_error">"Failed to export contacts to Download folder.
         Check Apps → baresip → Permissions → Storage."</string>
-    <string name="imported_contacts">Imported contacts from Download folder.</string>
+    <string name="imported_contacts">Contacs imported.</string>
     <string name="import_error">Failed to import contacts from Download folder. Check Apps →
         baresip → Permissions → Storage and that file \'contacts.bs\' exists in the folder.</string>
 
@@ -256,6 +256,8 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
     <string name="dots" translatable="false">…</string>
 
     <!-- Main Activity -->
+    <string name="export_all">Export</string>
+    <string name="import_all">Import</string>
     <string name="about">About</string>
     <string name="restart">Restart</string>
     <string name="quit">Quit</string>
@@ -285,7 +287,8 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
     <string name="dialpad">Dialpad</string>
     <string name="call_already_active">You already have an active call.</string>
     <string name="start_failed">Baresip failed to start. This may be due to invalid Listen Address
-        or TLS file. They have been reset. Restart baresip.</string>
+        or TLS file. They have been reset. Restart baresip.
+    </string>
     <string name="registering_failed">Registering of \`%1$s\` failed.</string>
     <string name="no_microphone_permission">You have not granted microphone permission.</string>
     <string name="verify">Verify</string>
@@ -297,7 +300,16 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
     <string name="call_not_secure">This call is NOT secure!</string>
     <string name="peer_not_verified">This call is SECURE, but peer is NOT verified!</string>
     <string name="call_is_secure">This call is SECURE and peer is VERIFIED!
-        Do you want to unverify the peer?</string>
+        Do you want to unverify the peer?
+    </string>
     <string name="unverify">Unverify</string>
+    <string name="exported_all">Exported all application data to Download folder file \'baresip.bs\'.</string>
+    <string name="export_all_failed">Failed to export application data to Download folder file
+        \'baresip.bs\'. Check Apps → baresip → Permissions → Storage</string>
+    <string name="imported_all">All application data imported. You need to restart baresip.</string>
+    <string name="import_all_failed">Failed to import application data from Download folder. Check Apps →
+        baresip → Permissions → Storage and that exported file \'baresip.bs\' exists in the folder
+        and, if so, you gave correct Decrypt Password.
+    </string>
 
 </resources>