right now, we are using two hard-coded formats that we defined for rendering date-time values for Japanese, and for non-Japanese locales:

- "yyyy-MM-dd, HH:mm" for Japanese.

- "yyyy-MMM-dd, HH:mm" for all other locales. 

we should not write and maintain our own logic for manipulating date-time formats per locale - we should use a predefined date-time format that will take care of the manipulation for us. 

following Alexander's suggestion in https://gerrit.ovirt.org/#/c/42875/: I recommend going over all pre-defined date-time formats in [1], looking for the one that renders "yyyy-MMM-dd, HH:mm" (or something very close to it) in the 'en-US' locale, and go with that format for all locales - and, IIUC, the format will adjust itself properly for every locale. 

[1] http://www.gwtproject.org/javadoc/latest/com/google/gwt/i18n/client/DateTimeFormat.PredefinedFormat.html