1. .po opened up in PoEdit (WordPress wordpress plugin translation file)
  2. clicking Update plurals are lost, here's a good example

Before update

#: control.php:695
#, php-format
msgid "Page"
msgid_plural "Pages"
msgstr[0] "Página"
msgstr[1] "Páginas"

After update

#: control.php:695
msgid "Página"
msgstr "Páginas"

Already attempted a number of options here

"Plural-Forms: nplurals=2; plural=(n != 1);\n"

but always loose all plural when update button is clicked on.

Any idea to help keep the plurals after clicking the update button?