add support for algorithm environment in bicaption package

We hope to have bilingual captions for algorithm environment (provided by the algorithm package). For example, use the \captionsetup command:

\captionsetup[algorithm][bi-first]{  % Chinese caption
    subrefformat=parens,
    labelsep=Twospace,
    font=CapFont,
    skip=1bp,
    name=算法  % Chinese characters meaning "algorithm"
}
\captionsetup[algorithm][bi-second]{  % English caption
    subrefformat=parens,
    labelsep=Twospace,
    font=CapFont,
    skip=1bp,
    name=Algo.
}

Now the \bicaption{示例算法}{Example} looks like this: