Remove String redundancy in localization files

In general, redundancy in resources means additional and unnecessary translation effort and might even lead to unnecessary errors and inconsitencies.

1.
In some .properties files there is a heavy redundancy of Strings, that is, there exist several keys that point to the same word or phrase and could be reduced to one key without loss of flexibility.

Extreme example:

• net.refractions.udig.style.sld:
  net.refractions.udig.style.sld.messages.properties
  Also check:
• net.refractions.udig.printing.ui:
  plugin.properties (=> The word "Scalebar" occurs four times)

P.S. Updated and confirmed 2005-11-13