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Help users trying to input a template as upload date

Authored by matmarex.

Description

Help users trying to input a template as upload date

If the user types '{{', assume that they are trying to input template
wikitext and switch to 'arbitrary' mode. This might help confused
power-users (T110026#1567714) and shouldn't affect anyone else.

Bug: T110026
Change-Id: I7b57ebb7250ac0ad35db842df6f5e30c4a7123e7