If you have iFile you can:
Navigate to SYSTEM/LIBRARY/WEEAPPPLUGINS/AttributionWeeApp/ open your language.lproj, open LOCALIZABLE.strings and delete The text after "ATTRIBUTION_PHONE". Then navigate back to AttributionWeeApp and rename "SiriYBangLogo". Respring. Done.
This worked on iOS 7...
Just tried on my iPhone 6 and it still works. I didn't even know that text was still present I've been using the darksky widget...