Links to other languages don't work, if no parameter "pagename" or "title" is given

[Former user]

If one accesses the GeoHack by an URL containing neiter a parameter "pagename" nor a parameter "title", e. g. https://tools.wmflabs.org/geohack/geohack.php?params=50_N_10_E, the links to the languages in the "Languages" menue on the left side of the GeoHack-page produce an falsely structured and thus invalid URL, leading to an 404 page.

E. g. when clicking on "Deutsch" it links to https://tools.wmflabs.org/geohack/de/50_N_10_E instead of https://tools.wmflabs.org/geohack/geohack.php?language=de&params=50_N_10_E