Handling unicode characters in card titles

[tylersticka]

I noticed last week that the script was no longer rendering anything. After troubleshooting for a while, I determined that a unicode character in a card title seemed to be the cause.

Adding the following to the script resolved the issue for me:

# Use UTF-8 in case content includes unicode characters
export LC_ALL='en_US.UTF-8';

I didn't want to submit this as a PR because en_US might be a big assumption, I didn't know how to reliably append UTF-8 to a locale, and I didn't know if there might be any unintended side effects of this if run from Terminal. But I thought I'd include here in case anyone else runs into the issue.