Add special WiFi calling strings for Vodafone

Vodafone specifically wants the ongoing notification to display as "WiFi
call", rather than "WLAN...". It appears that our specific settings for
mcc262-mnc01 are used for mcc2620-mnc02, which is why the string doesn't
show properly.

This CL adds a specific strings.xml file for mcc2620-mnc02 to fix the
issue. Additionally, VF does not want these strings to be translated,
hence the 'translatable="false"'. I confirmed that this string will have
a separare message id from the strings in values/strings.xml and so
won't interfere with the translations.

Since it's just the "WiFi call" which must not be translated, this CL
refactors how we choose the content string for Wifi call notifications.
This change could have applied to the rest of the logic, but was not to
keep the change minimal for OC DR. I filed http://b/64525903 to track
work to fix up the logic.

See the related framework changes:
http://ag/q/topic:wificall_no_tr+(status:open+OR+status:merged)
Screenshot:
https://screenshot.googleplex.com/3DS74zm9bBM
Bug: 64487733
Test: StatusBarNotifierTest
PiperOrigin-RevId: 164765234
Change-Id: Ic3e7a60316cf1748259f61d5c5abd95b0303e69d

0 files changed, 0 insertions, 0 deletions