Hi @bobishh! It’s a pretty broad question, but I’ll throw in a few thoughts =)
For localization, there are a few different approaches, but I really like this one which seems very clean and flexible. (Disclaimer: I haven’t actually used it myself, but I really like the concept and I know that others have used it successfully.)
For general UI creation, I’d suggest checking out elm-ui, which is a popular and fantastic package for laying out UIs without having to worry about the weird bits of HTML and CSS (this one I have used on several projects and it’s great).
I’d also suggest using elm-format to format your code - it can take a bit of getting used to depending on what you expect, but it’s great not to have to worry about formatting (and the majority of Elm developers do use elm-format, so if you get used to its style then it should be easy for you to read other people’s code and collaborate with them).