Thread:Support/Typos, grammar on Translate - First Steps messages

Request following amendments to First Steps:
 * trough → through
 * return back → return
 * now is good time → now is a good time
 * afraid if still → afraid if it still
 * Unfortanely → Unfortunately
 * want receive newsletters, you can opt-out → want to receive newsletters, you can opt out
 * want receive newsletters, you can opt-out → want to receive newsletters, you can opt out