[Fix Bug 904758] Fixes search box placeholder text cut off and search on logged in homepage.

See the following comment for reference:
[https://bugzilla.mozilla.org/show_bug.cgi?id=904758#c11](https://bugzilla.mozilla.org/show_bug.cgi?id=904758#c11)

I also found the text cut-off on the about mozillians page, as it still uses the old base template and styles. You'll see that fix in this PR too.