Merge branch 'drop_corporate_text' into 'nightly'

Drop corporate text plus minor rewording

Following [this discussion](https://gnusocial.no/conversation/190441#notice-190441) I only fixed corporate-only occurrences. I suggest People instead of User directory. Moreover I fixed a minor inconsistency (Trends should be preferred to Trending topics).

The full locale folder should be fixed once we have digitaldreamer's feedback. But we can at least start from this.

See merge request !16