When activity bundles are loaded, the activity name and summary are
pulled from an activity.linfo file that is associated with
locale. However, sometimes locale, which uses $LANG has been
superceded by $LANGUAGE as set in
extensions/cpsection/languages/model.py. This patch uses the same
algorithm as gettext.py to find activity.linfo
This problem is seen on the .AU systems which use en_AU for locale and
en_GB for LANGUAGE.
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