@dgroat. Thanks for posting. You can alter the column heading either by editing the “language/en-GB/en-GB.mod_easyfolderlisting.ini” on line 76, MOD_EFL_FILENAME=”Filename”, or you can created a Language Override (Extensions > Language(s) > Overrides > New) for the “MOD_EFL_FILENAME” key, and enter whatever text you like.
I would advise to try the built-in Override feature first before editing files. Let me know how it works out.