Ensure there is a <language here> spell check available

[bsclifton]

Carried over from browser-laptop

Let's add spell-check support for these languages

• Hungarian (via Hungarian spell check missing  browser-laptop#14678)
• Portuguese (via Add Portuguese (Portugal) to Spell Check Options browser-laptop#14365)

Related: #726

[Alino]

Hi, I have related questions:

1. Where could I find any spell check dictionary in the brave code? (I couldn't find any, but the Brave browser does actually highlight some spelling errors for English).
2. Are you going to add the open source hunspell dictionaries?

I want Slovak language to be added in brave. And I wanted to improve hunspell for Slovak because it is missing so many words. My idea was to use spell check in Brave, and when I find errors and missing words, I wanted to fix these issues and commit to the official hunspell, so that you could regularly update to the latest dictionary.

EDIT: I was doing some research, and found that dictionary files are coming from some remote site
#1947 and these .bdic files seem to be maintained by chromium devs and they merge it from hunspell maintainers.