Errors in translatable strings

[Gareth Jones]

While updating the en_GB translation I noticed a few mistakes in the translatable strings as they appear in the source code, which I assume will affect the other translations if they are fixed. I've listed them below, with line numbers taken from Hg versions as of tmodes 2011-01-11 commit (changeset 4813 8d6319da53fc?):

Spelling and grammar:

hugin1/hugin/AboutDialog.cpp:183
FIXME: "ressources" spelt wrong.

hugin1/hugin/AssistantPanel.cpp:330
FIXME: Double "the the".

hugin1/hugin/AssistantPanel.cpp:431
hugin1/ptbatcher/FindPanoDialog.cpp:259
FIXME: "successful" -> "successfully".

Inconsistent use of British English instead of American in untranslated strings:

hugin1/hugin/GLViewer.cpp:149
FIXME: Should probably be "initializing".

translations/xrc.cpp:423 xrc.cpp:423
FIXME: Should probably be "Colors:".

[tmodes (tmodes)]

Thanks, commited to default branch