Support more country specific transliterations

[Tazinho]

For example german:
Ä -> AE; Ö-> OE, Ü -> UE,
ä -> ae, ö -> oe, ü -> ue, ß -> ss

[Tazinho]

Danish doesn't seem to work, see:

> to_any_case(c("Æ", "Ae"), transliterations = "Latin-ASCII")
[1] "ae" "ae"
> to_any_case(c("æ", "ae"), transliterations = "Latin-ASCII")
[1] "ae" "ae"
> to_any_case(c("Ø", "Oe"), transliterations = "Latin-ASCII")
[1] "o"  "oe"
> to_any_case(c("ø", "oe"), transliterations = "Latin-ASCII")
[1] "o"  "oe"
> to_any_case(c("Å", "Aa"), transliterations = "Latin-ASCII")
[1] "a"  "aa"
> to_any_case(c("å", "aa"), transliterations = "Latin-ASCII")
[1] "a"  "aa"

All together:

• German + tests
• Danish + tests
• Swedish + tests
• Norwegian + tests
• Finnish + tests
• Icelandic + tests
• Faroese + tests
• Greenlandic + tests
• Czech + tests
• Dutch + tests
• Turkish + tests

Also Need to update the following files

• function documentations

• Readme

• News

• Also need to allow users to specify a list of replacements. Done via named transliteration arguments.

• need to document the mappings here in a more transparent and structured way.

See discussions:

• http://forum.camendesign.com/language_specific_transliteration_re_transliteration
• cocur/slugify@64af0ea