Language sensitive italicized quotation with csquotes

Question

In what follows:

\documentclass[fontsize=11pt]{book}
\usepackage{microtype}
\usepackage{times}
\usepackage{csquotes}
\usepackage[frenchb]{babel}
\frenchbsetup{IndentFirst=false}
\begin{document}
text in French \foreignblockquote{english}[][.]{quotation in English} text in French text \blockquote[][.]{quotation in French}
\end{document}

I would like to have the quotation in English italicized. It is obviously possible to use \renewcommand{\mkblockquote}[4]{\emph{#1}#2#4#3} but it will affect all the block-like quotations. I had a quick look in the csquotes.sty file but it is too complicated for me. I also had a look at the conditional statements available in the package but none are language-related.

Answer 1

In both \mktextquote and \mkblockquote, add

\iflanguage{english}{\itshape}{}

at the appropriate position. (\iflanguage is a babel conditional.)

\documentclass[fontsize=11pt]{book}

\usepackage[frenchb]{babel}

\usepackage{csquotes}

\renewcommand{\mktextquote}[6]{%
  #1%
  \iflanguage{english}{\itshape}{}% ADDED
  #2#4#3#6#5%
}
\renewcommand{\mkblockquote}[4]{%
  \iflanguage{english}{\itshape}{}% ADDED
  #1#2#4#3%
}

\begin{document}

text in French
\foreignblockquote{english}[][.]{quotation in English}
text in French
\blockquote[][.]{quotation in French}
text in French
\foreignblockquote{english}[][.]{quotation \\in \\English}
text in French
\blockquote[][.]{quotation \\in \\French}
text in French

\end{document}