Add more hacks to correct CLDR data

For Russian:

• Convert AM/PM which are badly formatted in CLDR to replace it by the proper cyrillic
• Add a dependency on Text::Iconv so non unicode get the proper encoding for AM/PM
• fix the date format having 'r.,' and convert it to 'r.' (also fixed in Bulgarian)

For All:

• Use complete Day of Week instead of the abbreviated one

Reported by: ache