Add text icon in decrypt list

Conflicts:
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptListFragment.java

Graphics/get-material-icons.sh

@@ -44,6 +44,7 @@ python copy OpenKeychain social grey person 48
 python copy OpenKeychain communication grey email 24
 python copy OpenKeychain social black share 24
 python copy OpenKeychain content black content_copy 24
+python copy OpenKeychain communication black chat 24
 
 # navigation drawer sections
 python copy OpenKeychain communication black vpn_key 24

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptListFragment.java

@@ -324,7 +324,9 @@ public class DecryptListFragment
 
                     Drawable icon = null;
 
-                    if (ClipDescription.compareMimeTypes(type, "image/*")) {
+                    if (ClipDescription.compareMimeTypes(type, "text/plain")) {
+                        icon = getResources().getDrawable(R.drawable.ic_chat_black_24dp);
+                    } else if (ClipDescription.compareMimeTypes(type, "image/*")) {
                         int px = FormattingUtils.dpToPx(context, 48);
                         Bitmap bitmap = FileHelper.getThumbnail(context, outputUri, new Point(px, px));
                         icon = new BitmapDrawable(context.getResources(), bitmap);