For theme, you will have to work on editing the content. Just grab/buy any theme and edit the content from English to French.
For billing/client management, use WHMCS with French as your language. WHMCS has built-in language support for French Language Files - WHMCS Documentation
Do you require html or WordPress theme? Check out themeforest, they have great collection of themes at great price. However, you will have to work on the content, no theme comes with content.
For cheap templates, you can checkout Themeforest.com. For billing system, you can use WHMCS, HostBill or any other preferred billing system. Once you have your template, you can edit the content in French.
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