Wikimedia DC has started publishing the Wikimania videos on YouTube. They are not split by presentation, only by track, but here are some about localisation and internationalisation.
My Wikimania presentation (see my previous post), Translating the wiki way (starts at 28:05; watch on YouTube):
Amir’s Supporting languages, all of them and Siebrand’s A Tale of Language Support and Ask the Language Support People (watch on YouTube):
Santhosh’s Read and Write in your language has not been published yet and nobody seems to know if it will, or if it has been recorded at all.
Alolita’s The next billion users on Wikipedia with Open Source Webfonts and Amir’s The software localization paradox (watch on YouTube):
See also the category on Wikimania wiki for abstracts and slides for these presentations.