Change subtitle in Leittexte>Kunsttheorie (Wilhelm Ternite)

the year is wrong and needs to be changed:
old: Wilhelm Ternite: „Wandgemälde aus Pompeji und Herculanum“ (1838-1858)
new: Wilhelm Ternite: „Wandgemälde aus Pompeji und Herculanum“ (1839-1858)

Please deploy to live as soon as possible.

Edited May 06, 2022 by rmraschkowski

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