Logo configuration for *.wiktionary

The new Wiktionary tiles logo is optimized for a 128px width.

For reference, the 128px width allow to restrict the height to 155px
instead of 164px, and then to allow the logos to fit in the 160px
height of the p-logo element.

Old logos ... (PNG version, generally at 135px)
New logos ... (SVG version, 128px)

This change also deploys the localized logo on sk.wiktionary:
Old logo ... (standard)
New logo ... //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Wiktionary-logo-sk.svg/128px-Wiktionary-logo-sk.svg.png

This change is a follow-up of Ia8e258214eb684a1285f7a9cdb32e7b395d4c320.

Change-Id: I6806c875e4d16102d4a7c106e2fd0fe4edf36e45