Added missing translation, fixed typos, rephasing (de-de)

[Deutscher775]

• Added missing translations (comparing to en-gb)
• Fixed grammar issues
• Added chatWindow to overcome hard-coded texts in chat window
• Moved messageContextMenu into chatWindow
• Rephrased some weird sounding phrases

[Deutscher775]

Made a typo in peopleAndFantasy which must be peopleAndBody, fixed PR coming