All elements in property files use escape sequences for = and :. This is not needed:

http://java.sun.com/j2se/1.3/docs/api/java/util/Properties.html#load(java.io.InputStream)
"All remaining characters on the line become part of the associated element string."

this makes those files difficult to read.

Take a look at
./src/java/net/sf/navigator/displayer/DisplayerStrings.properties
Line 2:
dd.menu.top=<table width\="150" style\="background-color\:lightgrey" cellpadding\=1 cellspacing\=1><tr align\=left><td nowrap class\=normal><b>

Could be written as
dd.menu.top=<table width="150" style="background-color:lightgrey" cellpadding=1 cellspacing=1><tr align=left><td nowrap class=normal><b>