tests: force the English locale for dolphinmainwindowtest

testWindowTitle compares the window title against fixed strings such as
"Home" and "Trash". On a machine configured for another language the
title comes back translated, for example "Dossier Personnel", and the
test fails.

Set the language environment variables to English in main(), before
QApplication is constructed and before any translation is loaded, so the
comparisons are deterministic regardless of the machine's configured
language.

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