Cannot set the map language

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My website supports two languages: en, de. The currently selected language is set in the `` attribute. The user may choose the language they want out of these two. The map should follow that as well.

Without this plugin, my maps are always in German, no matter what I do.

With this plugin, the map follows the browser's first language (if supported, see #4) but not the page content's language from the above attribute.

I saw that there is a `setLanguage` method but it requires a parameter `style` which is not documented. I have no idea what I should pass to it. So I cannot consider that method. And then there's nothing left. The plugin cannot set the map language to the page language.

Start by inspecting the plugin's setLanguage method and its browser-language handling, focusing on the undocumented style parameter and the page's html lang attribute. Done means the map language follows a supported page language such as en or de, with behavior covered by an appropriate test.

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