support multilingual releaseNotesLink (xml:lang)

[kenjiuno]

Hi.

I'm willing to prepare at least 2 releaseNotes for English and Japanese within single appcast xml.

From a certain sparkle documentation, at Localization section, it says xml:lang is useful for localization.
https://github.com/sparkle-project/Sparkle/wiki/Publishing-An-Update

If I tried that, the some releaseNotes URLs were concatenated into one URL.

Is there any chance to support xml:lang attribute that is seen in that documentation so that we can supply multilingual releaseNotes from single appcast xml?

[vslavik]

Is there any chance to support xml:lang attribute

Yes, especially if you help out with a patch…

I'll keep this in mind when adding i18n support, I agree this is an important of that.