Ignore 'Language' header in PO-templates #666
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The tools 'xgettext' from GNU gettext and 'pot-create' from lingua
both produce PO-template files containing a 'Language' header with
an empty string as value.
Babel has issues creating catalogs out of such templates.
It wants to parse the PO-template as a normal PO-catalog using the
locale of the target catalog, because it helps producing the correct
plurals. But it overwrites this locale when parsing the 'Language'
header and then it can not produce a valid catalog.
Ignoring the 'Language' header when it is known that the file being
processed is a template avoids this issue.
GitHub: fixes #665