TBX: move the separator characters of the chart tool tips to the messages.properties system to be able to edit them for each langage
e. g.: no space before the character in EN.
Validation test
* create all supported kinds of charts of JFC charts engine:
Specificities (bar plot), Specificities (line plot), CA factorial map,
CA Eigenvalues bar plot, Partition dimensions and Progression in
cumulative mode
* check the mouse over tool tips of all these charts in FR, RU, EN. The
separators between labels and values must be " : " in FR, “: ” in EN and
RU
MD: *OK Linux64
(from redmine: issue id 1098, created on 2014/11/03 by Sebastien Jacquot)