imageapi 6.x-1.8

Note that the 6.x-1.7 release was tagged on the wrong branch.

Changes since DRUPAL-6--1-6:

• #630632 by Simon Georges: French translation.
• #540486 by Berdir and c.ex: PHP 5.3 sad when given warnings rather than references.
• #781090 by N2H: ImageAPI Arabic translation.
• by Miles and Zoltan Balogh: Hungarian translation
• latest Ukrainian translation from L.D.O
• #360193 by Paul Kishimoto and drewish: Get ImageMagick working with relative paths in subdirectories.
• #450046 by TR: Don't report error at admin/reports/status when PHP memory limit set to -1 (Unlimited)