Fix post-call-to-action copy

[thomasgwatson]

closes #680 #923 #1520

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cd7c418) 46.65% compared to head (ca91b0c) 46.65%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1562 +/- ## ======================================= Coverage 46.65% 46.65% ======================================= Files 568 568 Lines 13257 13258 +1 Branches 3790 3791 +1 ======================================= + Hits 6185 6186 +1 Misses 7072 7072 ``` | [Files](https://app.codecov.io/gh/Hylozoic/hylo-evo/pull/1562?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hylozoic) | Coverage Δ | | |---|---|---| | [src/components/Button/Button.js](https://app.codecov.io/gh/Hylozoic/hylo-evo/pull/1562?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hylozoic#diff-c3JjL2NvbXBvbmVudHMvQnV0dG9uL0J1dHRvbi5qcw==) | `100.00% <100.00%> (ø)` | | | [src/components/CreateModal/CreateModalChooser.js](https://app.codecov.io/gh/Hylozoic/hylo-evo/pull/1562?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hylozoic#diff-c3JjL2NvbXBvbmVudHMvQ3JlYXRlTW9kYWwvQ3JlYXRlTW9kYWxDaG9vc2VyLmpz) | `100.00% <100.00%> (ø)` | | | [src/components/PostEditor/PostEditor.js](https://app.codecov.io/gh/Hylozoic/hylo-evo/pull/1562?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hylozoic#diff-c3JjL2NvbXBvbmVudHMvUG9zdEVkaXRvci9Qb3N0RWRpdG9yLmpz) | `70.38% <100.00%> (+0.11%)` | :arrow_up: | | [src/components/StreamBanner/StreamBanner.js](https://app.codecov.io/gh/Hylozoic/hylo-evo/pull/1562?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hylozoic#diff-c3JjL2NvbXBvbmVudHMvU3RyZWFtQmFubmVyL1N0cmVhbUJhbm5lci5qcw==) | `62.12% <ø> (ø)` | |

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[tibetsprague]

oops, looking at this again and noticing that you say that a post requires a Description, which it doesn't, only a Title actually