Incorrect case of month names

Month names are printed in the nominative case for all languages except Russian, where it should be январь instead of января in the example bellow, compare:

• --language de_DE:
• --language en_US:
• --language fi_FI:
• --language fr_FR:
• --language ru_RU:

That’s caused by: https://github.com/flopp/GpxTrackPoster/blob/2a405da9dbdb153c584beed055fd84879724a075/gpxtrackposter/calendar_drawer.py#L105 Let’s check it:

$ python
>>> from datetime import datetime
>>> import locale
>>> locale.setlocale(locale.LC_ALL, 'ru_RU.UTF-8')
'ru_RU.UTF-8'
>>> datetime.today().strftime('%B')
'сентября'

[flopp]

@sikmir I’ve just added explicit month translations (with initial translations based on strftime('%B')).

I would be great if you could fix the Russian translation file (locale/ru_RU/LC_MESSAGES/gpxposter.po) such that the month names are correct.

[flopp]

@sikmir for now, I’ve added localization.py with functions localized_day_of_week_name and localized_month_name that use the day/month names of the current locale by default. If a language (like Russian) requires some special treatment, the functions can be adapted accordingly; I’ve already done this for Chinese short day names. You can now extend localized_month_name with the special cases for Russian.