update translation howto to kf5

Review Request #7166 - Created June 3, 2016 and submitted - Latest diff uploaded

Information
Burkhard Lück
kde
Reviewers
l10n
dfaure, jriddell, tsdgeos

see description
please review my FIXME's and commnt

passes checkXML
with the warning:
translation-howto.docbook:546: element foreignphrase: validity error : Value "fr-CH" for attribute lang of foreignphrase is not among the enumerated set
<foreignphrase lang="fr-CH">"Case Postale"</foreignphrase>, while to Zurich in t
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