Returns a .po file with a missing plural formula.
function getPoFileWithMissingPlural() {
return <<<EOF
msgid ""
msgstr ""
"Project-Id-Version: Drupal 7\\n"
"MIME-Version: 1.0\\n"
"Content-Type: text/plain; charset=UTF-8\\n"
"Content-Transfer-Encoding: 8bit\\n"
msgid "Monday"
msgstr "Ponedjeljak"
EOF;
}