[DEV-2056] Correct landing page copy.
[DEV-2056] Lowercase "question(s) about dogs."
[DEV-2056] "Sort by" to "Sort."
[DEV-2056] en-dash to em-dash in community header.
[DEV-2056] Lowercase "sort" on tab bar.
Merge pull request #46 from roverdotcom/DEV-2056

[DEV-2056] Updated front-page copy.