Update dictionaries (possibly_offensive flag)

Correctly encoding possibly offensive words with their correct
frequency and the possibly_offensive flag set.

Continuing to encode with zero frequency only distracters or
words that should never come up.

https://paste.googleplex.com/5167060875214848

Bug: 11031090
Change-Id: Ia394b1827f292ff8d4791cc2f3e6e50b5aff4cbe