How to tell chrome language of your web site (as a hint to the translate bar)
I would just add a lot of text in the about section or in a hidden div, or something like that - your browser may need some more text to correctly define a language.You're not the first one to have this problem.
They said you could avoid translation by doing this:
<body class="notranslate">or:
<meta name="google" content="notranslate" />But have a look yourself :)
I know this doesn't answer your question, but you could add Estonian as one of your preferred languages, then Chrome wouldn't offer to translate it for you.
This google language detection code might help you identify where the problem is.