Government policy in Wales is that publications must be available in both English and Welsh, so people in Wales are very much used to negotiating this sort of option online (written media are also presented bilingually).
Here's the Welsh Government home page, notice the same configuration for the placing of the language option: http://gov.wales/?lang=en
If you follow a link to the Welsh Government site that doesn't set the language, you're presented with this page, with the same option: http://gov.wales/splash?orig=/
Plaid could have presented its default home page in both English and Welsh, but that would potentially be more confusing and messy, and the options for translation would have had to be more complicated and less elegant.
They had to opt for one language as the default, and given their history and stance on the Welsh language, it's not a surprise that the default language is Welsh. One simple, clearly signposted click and it's in English. It's not a big deal.
Welsh Labour dealt with the issue like this: http://www.welshlabour.org.uk/ Links and Headings are in both Welsh and English, but I haven't been able to find any Welsh body text on the site, so it's confusing (and would be frustrating if you were expecting bilingual options, which the links/headings suggest would be available).
The Welsh Conservatives don't seem to deal with it at all: http://www.welshconservatives.com/ Click on "Croeso" or "Welcome" and nothing changes - English, like it or leave it.
The Wales Green Party also offers English as the default, with the language option less clearly placed: http://www.walesgreenparty.org.uk/ If you follow any links within the site with language set to Welsh, it's a bit of a mess, and a lottery as to what language you're presented with on any particular page.
Perhaps unsurprisingly, aside from the word "Cymru" alongside "Wales" in its title, UKIP Wales makes no reference to the Welsh language at all: http://www.ukipwales.org.uk/ (The site's also slow as hell here at the moment.)
(As an aside, Plaid Cymru's leader, Leanne Wood, isn't a native Welsh speaker, though she's learning the language.)
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