Multilingual sites and SEO

What is the impact of multilingual versions of Contao pages on SEO? Do the web crawlers see two pages with the same content but different language as two different web pages? I suppose they do, so is it neccessary or recommendable to tag one of them as canonical page of original version (fallback page)?

On other hand I can see something like this in Page Source

Code:

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<link rel="alternate" hreflang="en" lang="en" href="index.php/en/page" title="Page title">
<link rel="alternate" hreflang="sr" lang="sr" href="index.php/sr/page" title="Page title">

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so is it possible that Contao already gives a proper information to search robots?

Quote:

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Originally Posted by tetrijeb

so is it possible that Contao already gives a proper information to search robots?

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Not sure but I think so. Additionaly you can create separate sitemaps in each website root - sitemap-en, sitemap-ba ...

Quote:

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Originally Posted by tetrijeb

On other hand I can see something like this in Page Source

Code:

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<link rel="alternate" hreflang="en" lang="en" href="index.php/en/page" title="Page title">
<link rel="alternate" hreflang="sr" lang="sr" href="index.php/sr/page" title="Page title">

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so is it possible that Contao already gives a proper information to search robots?

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This is generated by the [changelanguage] extension.