As someone who frequently switches between documents in different languages, it would be great to have a possibility to set a language for the spellcheck on a document level. Otherwise I always have the problem that my entire document is underlined in red… 
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I added my language in my browser settings and the red underlines went away.
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Coda doesn’t have native spell checking, it is always a browser setting. I have 4 languages set and all 4 languages are auto recognized.