Description:
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The formatting of strings containing apostrophes is wrong.

Test script:
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$locale = 'fr_FR';
$args = array(1);
$string = "{0, choice, 0<{0} d'eé|1<{0} d'aà}";
echo msgfmt_format_message($locale, $string, $args);
$string = "{0, choice, 0<{0} d''eé|1<{0} d''aà}";
echo msgfmt_format_message($locale, $string, $args);

Expected result:
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1 d'eé

1 d'eé

Actual result:
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1 deé|1<1 daà

1 deé