Fix limit data usage dialog body not being translated.

- need to pass the resource id instead of the text when building the
dialog in order for it to react to language change.
- also remove the unnecessary set/get the body message in the dialog
creation since the msg id can be used directly.

Change-Id: I399dcda54961fac457fc5f0fad9082f2c1e1a2b2
Fixes: 77897157
Test: run i18nscreenshots