Combine 5G and recommended strings

for RTL languages, the 5G string should actually go to the right of the
"(recommended)" string. Because concatenating these two strings is
difficult to control programatically, this change combines the two
strings into one so that translators can place each string in the
correct location accordingly.

Bug: 185245370
Screenshot: https://screenshot.googleplex.com/8tn6qdvK2iGzvUv (looks
identical to before in english)
Test: atest -c SettingsUnitTest

Change-Id: I3511306a76ba9a0e6d30b62a6c7eb79f991a0262