>1. Have a different font-size for every language

What about fonts itself for French is it the same Tahoma (which I prefer), Airel, Verdana, etc.?

>The longer it takes, the smaller the font. Of course you should avoid using anything bellow 8 point or so.
>
>2. Leave plenty of room in all UI for growing label.

Okay

>If you make a proper standard, this could be nice even for the languages that are shorter.
>
>3. Retrofitting your controls to resize/rellocate based on the language ratio.

Pardon, I didn't get that one.

>This could be the best solution, but it is the harder to code, debug and implement.

Okay

>All this issues are what makes INTL Toolkit ( http://www.stevenblack.com/ ) so great. Even if you don't use it, take a look at the site, and you'll find plenty of great ideas. There are some articles about this topic there you can read for free.

okay I didn't know about that.

Appreciating all your help I am getting. Thanks.