People Details cosmetics

[tinne]

The following changes should be applied to the People detail view:

• Highlights should have the default daily rate added, with a localized label denoting the null value (not set).
• First booked and Last booked should have four digit years.
• The currency signs in avg. daily rate and budget burned must be removed. ~~They should be removed of configuration added to the project settings.~~

[FrederikSchlemmer]

The following changes should be applied to the People detail view:

• The currency signs in avg. daily rate and budget burned might be hardcoded. They should be removed of configuration added to the project settings.

We should extract this into another issue because the currency needs to be adapted in the whole project. The used currency signs are not hardcoded and will adopt to changed locales.

[tinne]

i18n and l10n moved to #448