[issue2018] TextCalendar.formatmonth is not influenced by setfirstweekday

[MATSUI Tetsushi]

MATSUI Tetsushi added the comment:

In the message msg62100, I asked about the place of *setfirstweekday()*.
Your answer in the message msg62173 was about *formatmonth()*.
I don't think the fix is complete until some explanations are given for
firstweekday and/or its getter/setter, since they have been mentioned
from your description fixes but have no entries.

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