Minor improvem. to pure component property viewer

Propertys are displayed now even if no stream is defined yet.
Rendering of molecule from SMILES only in cases where definition is
available.
Improved german translations.
Datatable at pure component dialog

Addition of datatable with temperature dependent data.
Data of diagram points are displayed as tool tip.
German translations at several points.
Merge pull request #4 from Greg66/master

Further improvements to pure property dialog