(bug 66256) decrease api high limit and update the paramstring

Sometimes Category.articles() does not retrieve any pages but fails
into 503 server error. The given api Request waits some minutes,
halves the limit and restarts the request. Unfortunately the
request paramstring was never updated. This patch solves that bug.

Change-Id: I65c0e8b63555161d9e147776195d97732fc8dc3c
Merge "(bug 66256) decrease api high limit and update the paramstring"