getty forum fixes

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Minor changes to the Getty contributor forum style. You may find it improves readability.Reformat the Getty contributor forums a wee bit, more in line with the old iStock forums.

Changes
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v0.0.9:
- tweaks for the new layout so that the Contributor Forums don't start closed.
v0.0.8:
- iStock balance is no longer available, so stop trying to display it.
v0.0.7:
- show iStock balance *if* you're currently logged in to iStock and you've not disabled the display of your balance.
v0.0.6:
- link to the iStock site.
v0.0.5:
- hide user details and make the avatar smaller.
v0.0.4:
- make stickies and announcements more obvious.
v0.0.3:
- change the "Like" button to "Say Thanks";
- spell 'arial' properly so that it gets picked up as a fall-back font.