add SRC subdirectories for add po file in locales (refs #4273)
change plural form for en (refs #4273)
add gettext test (refs #4273)
add useful gettext locale context functions (refs #4273)
add gettext context in layout (refs #4273)
whattext use src sub-directories for po source (refs #4273)
adjust test catalog (refs #4273)
use new po variable for makefile (refs #4273)
use new product locale rules (refs #4273)
Merge pull request #1010 from Eric-Brison/3.2-A4273

add src subdirectories to add po file in locales (closes #4273)