Rework encrypt for files with intents

org_apg/res/values/strings.xml

@@ -260,7 +260,8 @@
     <string name="error_wrongPassPhrase">wrong passphrase</string>
     <string name="error_savingKeys">error saving some key(s)</string>
     <string name="error_couldNotExtractPrivateKey">could not extract private key</string>
-
+    <string name="error_onlyFilesAreSupported">Direct binary data without actual file in filesystem is not supported</string>
+    
     <!-- progress_lowerCase: lowercase, phrases, usually ending in '…' -->
     <string name="progress_done">done.</string>
     <string name="progress_initializing">initializing…</string>