qt: Bump transifex slug for 22.x
qt: Bump transifex slug for 22.x

Opening the 22.x translations early because of experimentation with the
new xliff translations format.

In this context, change file_filter to `xlf` as well as the files
pulled with `tx pull` are that format now (the setting only affects the naming
not the format of the files).

Tree-SHA512: e0c18aa5e6cbd4428d24324fee8e5761b70dae51d0236277577aded719798c6a32fc81c0598f280321f2816629e33a334f61f9e7f6180c4074abfda6550cefbe

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