add user_access to l10n_community_block_help() && show only user/uid/edit link, when block is custom

Good suggestions!

I've committed an all-whitespace cleanup for the module, so I'm hopeful that you can reroll this patch with only the concrete changes. Please do.

- There are whitespace issues in the first hunk of the patch.
- In the second one, you query the blocks table, but you do not include the current theme key. May be a nitpick, but a block can theoretically be setup different ways in different themes.

Thank you! Renamed $blockcustom to $customizable and committed that. Keep these nice improvements coming!