Today is all about App Indexing day where we will only cover topics on Google App Indexing. Why? Because we launched our Search Engine Roundtable app for iOS (free download) and Android (free download) - please download it.
Last night, Google held a Google+ Hangout on App Indexing, with Google's Mariya Moeva, John Mueller and Krzysztof Muzyka. This is the second hangout on this topic that I am aware of, the first one we covered on August 25th - lots have changed since.
Google does support multilingual apps with Google App Indexing. The question came up at the 18 minute mark where the app developer said his app supports multiple languages, how do they get all the languages indexed in app indexing?
Krzysztof responded that there are three ways to handle this, he said:
Multiple languages is obviously supported and we support several scenarios in this.
One of them being the web site has a unique URL for every language and there is one corresponding activity for each URL. Another scenario would be that your web site has a unique URL for each language, but there is only one deep link in your app and that application uses the system language settings to display the correct language content. And then the first scenario is that the web site has one of the URLs for all languages, or only one of the languages ported, and there is one corresponding deep link. So this means that the web site and application must display the content in the same language when there is no preference set.
Here is the video embed at the start time, so you can listen yourself:
Forum discussion at Google+.