Make this bit more readable

Author: Hugo Osvaldo Barrera

contrib/conflict_resolution/resolve_interactively.py

@@ -48,14 +48,9 @@ def main(ical1_filename, ical2_filename):
             KDIALOG,
             "--warningyesnocancel",
             "There was a sync conflict, do you prefer the first entry: \n"
-            + get_summary(ical1)
-            + "...\n(full contents: "
-            + str(ical1_filename)
-            + " )\n\nor the second entry: \n"
-            + get_summary(ical2)
-            + "...\n(full contents: "
-            + str(ical2_filename)
-            + " )?",
+            f"{get_summary(ical1)}...\n(full contents: {ical1_filename})\n\n"
+            "or the second entry:\n"
+            f"{get_summary(ical2)}...\n(full contents: {ical2_filename})?",
         ]
         + additional_args
     )