Hi qiyang, thanks for the question. I'm CC'ing the apiman-user mailing list since I think the answer might be broadly helpful. :) There are various places where internationalization comes into play. You are asking specifically about the UI templates, so I'll address that first. The UI templates do contain the "default" language strings, which in this case are english. The UI is built on Errai/GWT, which comes with i18n support built in. The way it works is that Errai will automatically translate the strings in the templates by using an appropriate JSON translation bundle file for the current locale (if one exists). You can find the default bundle file here: https://github.com/apiman/apiman/blob/master/manager/ui/war/src/main/java... Because the defaults are *also* taken from the templates, I don't actually have any strings in the default bundle. However, the way this works is very similar to java message bundles - there would be multiple messages.json files with different locales, such as "messages_en_US.json" or "messages_fr.json". The framework will pick the right one at runtime based on the current browser locale. The other interesting thing to note is that during the build, Errai will output a couple of generated bundle files that contain all of the strings that *should* be present in the bundle file. This can be found here: apiman/manager/ui/war/target/classes/.errai/errai-bundle-all.json So we can take that file and copy it into src/main/java as mentioned above, and it could become the default bundle file. Then copy it again and rename it as messages_en_US.json and it would be the correct US English bundle file, etc... All of this should be working today, so creating a UI translation should be possible (with the caveat that we haven't actually tried it yet, so there may be some bugs). Note that there are also places in the UI *other than the templates* where user-visible strings are used and must be translatable. These strings are all located here: https://github.com/apiman/apiman/blob/master/manager/ui/war/src/main/java... Adding a string in that form will allow Errai to discover it at build time and include it with the rest of the strings it finds in the templates. Of course, there are also strings that are used on the server-side in both the API Manager and API Gateway that should also ideally be translated. In those cases (all non-UI related strings) we use standard java message bundles. :) -Eric On 12/26/2014 1:44 AM, qiyang(a)chinacloud.com.cn wrote: