Good question. The process requires a little of bit of data-mashing, as the phonotactic analyser requires the language to be in IPA. (It's like that because it needs to know what is a vowel and what's a consonant, and the Roman alphabet is just waaaay to inconsistent with that kind of stuff across languages to use spelling. Also it would be effectively useless for any foreign script.)
You need to take a sample of words in your target language, replace all the orthography symbols (spelling) with their IPA symbols. This obviously requires knowing how the target language’s spelling maps to its sounds. You can do this in Notepad using the Find and Replace feature. I recommend using Notepad++. You may need to be aware of the order that you do this in, same way when going in the opposite direction. You may need to be aware of capitals, depending on your sample of text. You may also need to be aware of punctuation symbols. Find an Replace these with nothing.
Your sample text goes in the "or analyse word structure of your own language" part. The samples texts for the default languages were the top most frequent words in that language. Anything from the top 100 to 300 words should actually give you a pretty good sample, since they probably account for 75% to 85% of the language. Failing this, you might just have to go to Irish Wikipedia and take a random sample of text. Checking Control Phonemes Frequencies will give you the actual distribution of the sounds, which should in theory make it more accurate.
Then you have to reverse the IPA back into spelling in Vulgar’s settings, or come up with your own spelling.
This is why I haven’t done it for every language. Heh..
It's not because it's American, but it could be because it's a gift card and not a full credit/debit card. We use Stripe for credit card payments, so unfortunately it's this website that's declining it, not us; it's a little bit out of our control. But PayPal or any other credit card should work.
Apologies for the inconvenience.
Are you using the latest template? https://www.overleaf.com/project/5e4e313ffba405000129eed4
The template changed a few months ago.
Otherwise, what's the error?
Yes it’s fairly simple - using the upload button on the side panel. But check out Overleafs documentation on how to do it because they actually do really good LaTeX documentation in general.
https://www.overleaf.com/learn/how-to/Including_images_on_Overleaf
Oh, I think it's easy to Google, but for convenience Electron is here. The blurb is "If you can build a website, you can build a desktop app. Electron is a framework for creating native applications with web technologies like JavaScript, HTML, and CSS." It's the framework that GitHub originally built for Atom.
I haven't built anything with it yet myself, but if you can distribute Vulgar as an HTML file, I'm betting it shouldn't be too hard to wrap it with Electron to distribute it as an app.