Update Algerian Arabic (ar_DZ) locale formats.

[infosrabah]

Based on the way date are represented in Algeria, the actual SHORT_DATE_FORMAT is 'd/m/Y' but the correct format is 'j F Y'.
The actual locale ar-DZ formats are also missing (pull request pending):

SHORT_DATE_FORMAT = 'j F Y'
SHORT_DATETIME_FORMAT = 'j F Y H:i' 

DATE_INPUT_FORMATS = [
     '%Y/%m/%d',  # '2006/10/25' 
]
TIME_INPUT_FORMATS = [
    '%H:%M',        # '14:30    
    '%H:%M:%S',     # '14:30:59'
]
DATETIME_INPUT_FORMATS = [
    '%Y/%m/%d %H:%M',        # '2006/10/25 14:30'
    '%Y/%m/%d %H:%M:%S',     # '2006/10/25 14:30:59'
]

NUMBER_GROUPING = 3

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The actual Date format are not the exact representation of a dates in the country.

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Even if most RTL other countries are using or still using 'd‏/m‏/Y ', Algeria is not. For every date on any resource (News, Official communications, News paper) that using Arabic as a language, the Date format is 'j F Y'.

​The Wikipedia describes the French language in Algeria (fr-DZ) LTR, not the Arabic (ar-DZ) that we are talking about here.

Abbreviations of months don't exist in Algerian Arabic that's why we need to use N in short formats instead of F.

[infosrabah]

correct format ar-DZ locale for Algeria country

[Mariusz Felisiak]

​PR

[Mariusz Felisiak]

​PR