(patch) Improve Wikipedia tag validators

[nyurik]

Wikipedia tags need a few more validators with fixers:

• update the list of valid Wikipedia languages
• auto-replace language be-x-old with be-tarask
• auto-replace language cz with cs
• remove space before page title ("en: Foo" -> "en:Foo")
• replace "_" with spaces ("en:Foo_bar" -> "en:Foo bar")
• replace "_" with spaces ("en:Foo_bar" -> "en:Foo bar")
• capitalize first letter if it's not "jbo" language ("en:foo" -> "en:Foo")

• double language link ("en:en:Foo" -> "en:Foo")

    This part is not implemented because it requires regex backreferences in validators,
    which don't work for some reason:  *[wikipedia =~ /^([-a-z]{2,12}:)\1/] {...}
  

This patch also adds a few additional validator functions: trim, upper and lower (for completeness)

[nyurik]

patch to fix this issue