Custom status messages/descriptions with commas/slashes

[avm99963]

Hi!

First of all, I'd like to thank you @tarampampam for building this! I'm using error-pages for my homelab Traefik instance and I like it very much :)

For a long time I've been customizing all the status messages/descriptions via the config file, and some include commas and slashes.

When the v3 update came out, I began trying to convert these definitions to the --add-code flag equivalents, but I noticed that using commas and slashes caused errors when parsing the flags because:

1. By default urfave/cli treats commas as a separator for the different elements of the string map.
2. Slashes are used for separating the message from the description.

I wanted to share that I worked around this by replacing these special characters in the flag with ##comma## and ##slash##. Then, in my custom template I replace these special strings back to actual commas and slashes using the strReplace function which you made available:

{{ strReplace (strReplace message "##slash##" "/") "##comma##" "," }}

It's not ideal, but I can continue using commas and slashes, so I'm happy with that ;)