Support msgctxt in po files instead of a vertical bar in the msgid
For developers, an extra optional context parameter has been
added to the gettext functions. For example, _('point size|pt')
should now be written as _('pt', 'point size').
For translators this would appear in the message catalog as:
msgctxt "point size"
msgid "pt"
msgstr "pt"
Implements #3416.
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