Extension manager fixes

Translation update (de-informal)

Wiki syntax page and minor

IXR_Date

Translation update (ru)

Translation update (ta)

Translation update (ru)

Translation update (it)

change two spaces to a space

In line 5 and 6, Message have two spaces, so I change them to a space.

Translation update (ko)

Translation update (de)

Translation update (tr)

Translation update (uk)

Translation update (ja)