go along the menu options and find one that has 5 options. The bottom one is the language one . go to it and you will see a list of the languages in their own language . so select English.
If this fails to work perhaps you need to delete your preferences when Lmewire is TOTALLY closed.
for deleting preferences see
Fixes for Limewire when LW isn't operating as it should
I believe Limewire opens by default in the language the computer is set for, but I guess that should be Dutch or French for you. All limewires have all the languages built in.