Customize Biblatex APA style for proceedings

Question

I am using Biblatex with APA-style, and I would like to change the way "in proceedings" references are displayed, from

Authors (year). Title. In Proceedings (pp. A-B)

to

Authors (year). Title. In Proceedings, pp. A-B

since the journal I'm submitting to requires this style. Any idea how to do so?

EDIT:

Here's a MWE.

test.tex

\documentclass{article}
\usepackage[style=apa,backend=biber]{biblatex}
\DeclareLanguageMapping{english}{english-apa}
\bibliography{test}
\begin{document}
\cite{twitter}
\printbibliography
\end{document}

test.bib

@inproceedings{twitter,
author = {Kwak, Haewoon and Lee, Changhyun and Park, Hosung and Moon, Sue},
title = {What is {Twitter}, a Social Network or a News Media?},
booktitle = {{International World Wide Web Conference}},
year = {2010},
pages = {591--600},
}

I assume that proceedings entries only contain author, title, booktitle, year, and pages fields, as in the MWE.

Answer 1

Assuming you still want all other information that could appear in the same pair of brackets placed in brackets, go with

\documentclass[british]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{babel} 
\usepackage{csquotes} 
\usepackage[backend=biber,style=apa]{biblatex}
\DeclareLanguageMapping{british}{british-apa}
\addbibresource{biblatex-examples.bib}


\renewbibmacro*{addinfo}{%
  \ifthenelse{\iffieldundef{edition}\AND%
              \iffieldundef{chapter}\AND%
              \iffieldundef{volumes}\AND%
              \iffieldundef{number}\AND%
              \(\iffieldundef{volume}\OR\boolean{bbx:volseen}\)}
  {}
  {\printtext{\bibopenparen}%
   \printfield{edition}%
   \setunit*{\addcomma\addspace}%
   \printfield{chapter}%
   \setunit*{\addcomma\addspace}%
   \notbool{bbx:volseen}%
     {\iffieldundef{volume}{}{\global\booltrue{bbx:volseen}}%
      \printfield{volume}%
      \iffieldundef{part}{}{\printfield{part}}}{}%
   \setunit*{\addcomma\addspace}%
   \printfield{number}%
   \setunit*{\addcomma\addspace}%
   \printfield{volumes}%
   \setunit{}%
   \printtext{\bibcloseparen}%
   \newunit}
  \setunit{\addcomma\addspace}%
  \printfield{pages}}

\begin{document}
\cite{sigfridsson,moraux,salam}

\printbibliography
\end{document}

This just moves the page printing outside the brackets.