updated german translation
used the oficial language codes for switch language
Merge pull request #197 from MaDill/master

updated german translation
updated ChangeLog
formatting
alphabetical order
version number => 1.10.1
added toBeTranslated attribute
cleanup (unused code)
unused code
optimization: cache zip file during reading
zip file optimization
resource file optimization
no tag lowercasing in xhtml
ZLUnicodeUtil::toLower() optimization: do not call java method for ascii strings
optimization
extracted InputStreamHolder interface
speed optimization
fixed 'duplicates issue'
release date