feat(ProfileFragment): display toast when saving note

It can be quite unclear if the note has been saved. This adds a toast,
to indicate that the profile note has been saved.

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

@@ -468,6 +468,7 @@ private void savePrivateNote(String note){
 			public void onSuccess(Relationship result) {
 				updateRelationship(result);
 				invalidateOptionsMenu();
+				Toast.makeText(getContext(), R.string.mo_personal_note_saved, Toast.LENGTH_SHORT).show();
 			}
 
 			@Override

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

@@ -16,6 +16,7 @@
     <string name="mo_settings_app_version" translatable="false">Moshidon v%1$s (%2$d)</string>
 
     <string name="mo_personal_note">Add a note about this profile</string>
+	<string name="mo_personal_note_saved">Note saved</string>
     <string name="mo_personal_note_confirm">Confirm changes to note</string>
     <string name="mo_personal_note_update_failed">Failed to save note</string>
     <string name="mo_settings_contribute">Contribute to Moshidon</string>