fix typos / terms / icons in UI

[nandaloo]

please fix these terms/typos/icons:

• Spezification -> Specification
• X_Axis -> X-Axis
• Y_Axis -> Y-Axis
• in facets: Prediction -> Model
• in facets: I know I made the icons, but they aren't good. please replace icons with terms:
  • first row: "aggregation"
  • second row: "samples"
  • third row: "marginals"
  • forth row: "density"
  • in top bar / tool bar:
  • is it correct that it says "new plot"? what is the correct established term for "plot"? plot? view? visualization?

• Spezification -> Specification
• X_Axis -> X-Axis
• Y_Axis -> Y-Axis
• in facets: Prediction -> Model

• in facets: I know I made the icons, but they aren't good. please replace icons with terms:

• first row: "aggregation"
• second row: "samples"
• third row: "marginals"
• forth row: "density"
• in top bar / tool bar:
• is it correct that it says "new plot"? what is the correct established term for "plot"? plot? view? visualization?