Returns a .po file with a broken plural formula.
function getPoFileWithBrokenPlural() {
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"
"Plural-Forms: broken, will not parse\\n"
msgid "Monday"
msgstr "lundi"
EOF;
}