program ignore some translation strings

[kessel systemausfall org]

hi all, 

at the moment i am translating epiphany into amharic. the responsible group 
seems to be died out - so i am writing to this list. 

i have a problem with my mo-files. Some strings of the translations seems to 
be ignored by the program. for example this string of the po-file: 

#: src/ephy-window.c:100
msgid "_Open..."
msgstr "ክፈት... (_O)" 

When i copy the poedit-generated mo-file to  
/usr/share/locale-langpack/am/LC_MESSAGES/epiphany.mo then this translated 
string doesn't appear in the file-menu (LANG=am_ET.UTF-8 epiphany). 

Do you have any idea how to fix it or a link to a appropriate manual? 

Thanks,
Klaus