Fiori 3.0 Visual Update: Table - Edit column header text and color.

[LeoT7508]

• Make column headers Camel Case.
• Update column header idle grey color to Neutral 5.

Design sheet can be found here: https://app.zeplin.io/project/5a8c458b6e231fc65bddbdfb/dashboard?seid=5aea1886fd8af67dae9ab1bb