Referring to this question (Change LaTeX caption language), I got the same problem and it does not get solved by the use of the correct language package.
Here is a MWE:
\documentclass[a4paper,twoside]{article}
\usepackage[a4paper,top=2cm,bottom=2cm,inner=6cm,outer=2cm]{geometry}
\geometry{twoside}
\usepackage{lmodern}%font
\usepackage[francais]{babel}%language corrector and punctuation rules
\usepackage[utf8]{inputenc}%encoding
\usepackage[T1]{fontenc}
\usepackage[font=small]{caption}%titres des figures
\usepackage{color}
\usepackage{array}
\usepackage{colortbl}
\usepackage[pdftex]{graphicx}
\begin{document}
\begin{table}[h!]
\caption{Calendrier approximatif du processus législatif.}
\begin{tabular}{>{\raggedleft}p{0.65\textwidth}
p{0.1\textwidth}
}
Analyse du problème, fixation des objectifs et définition des moyens d'action possibles & 1 an\\
\end{tabular}
\end{table}
\end{document}
What do I do wrong? Thank you!