Try loading even English translations if provided.

Doing so has negligible cost and can be useful in some situations (e.g.
when using symbolic msgids despite gettext best practices).

Patch by tmsorensen.

Fixes #15522.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74849 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775