Donation error string

mastodon/src/main/java/org/joinmastodon/android/fragments/DonationWebViewFragment.java

@@ -75,8 +75,8 @@ public class DonationWebViewFragment extends WebViewFragment{
 
 	private void onFailure(){
 		new M3AlertDialogBuilder(getActivity())
-				.setTitle("Failure")
-				.setMessage("Some sort of UI that would tell the user that their payment didn't go through")
+				.setTitle(R.string.error)
+				.setMessage(R.string.donation_server_error)
 				.setPositiveButton(R.string.ok, null)
 				.setOnDismissListener(dlg->Nav.finish(this))
 				.show();

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

@@ -774,4 +774,5 @@
 	<string name="donation_success_share">Spread the word</string>
 	<string name="donation_success_title">Thank you for your contribution!</string>
 	<string name="donation_success_subtitle">You should receive an email confirming your donation soon.</string>
+	<string name="donation_server_error">We are sorry, an error occurred and we have not been able to process your donation.\n\nPlease retry in a few minutes.</string>
 </resources>