Save customization of project, task, language resource, user and client management

Analogous to the saving of the customization of the editor (which columns to show, order of columns, etc) the customization of the project-, task-, user-, client- and language-resources management should be saved by user for:

• which columns are visible
• order of columns
• column the grid is sorted by
• set filter

To complete the setup regarding good usablity, above the project grid next to "Reset filters" a new button "Only my projects" should be introduced. Once clicked, a filter is set in the Project manager column, that shows only the projects of the currently logged in user.