Add ellipsis at end of title in notification

src/Overlay.cpp

@@ -1506,7 +1506,10 @@ namespace gsr {
             byte_index += codepoint_length;
         }
 
+        if(byte_index < str.size()) {
             str.erase(byte_index);
+            str += "...";
+        }
     }
 
     static bool is_hex_num(char c) {