An option to populate different template with --user-wordlist

[RosaWagner]

It would be nice to customise the waterfall and the proofer pages with custom text.

There would plenty of ways to approach such issue, but I was thinking adding tags to the user-wordlist file would be the most effective one? It would avoid complicated command lines.

Example:

# waterfall.html
ặằẳẵǎâấậầẩẫȁäǟ12984

# text.html
Il était une fois la vie.

# proofer.html
## kerning
uutsnn
uuannn
uulhnn
uuinnn
uuªnn
uulann
uualnn
uuennn
uuwann