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after install FAQ module, (the module add a node type "FAQ")
when creat first language (source)
click the translations link, there is no "source" language highlight, then will got error when create translation node.
must edit the contnet again, then click translations, this is the only way to make the "source" language highlight enable,
if uninstall FAQ module, the problem still exist,
so It need to edit and submit again when create every language content.