Fix up hub mode strings

Swaps "posturing" for "upright" as the preferred term and makes widgets
settings strings match dreams strings. Note that these are overlaid
on Pixel devices.

Also adjust character limits per l10n requests.

Bug: 330525061
Bug: 406573071
Test: verified on local device
Flag: com.android.systemui.glanceable_hub_v2
Change-Id: Id74c43bae2dd304965ac34f970d114e023f85664