Strip string locations before commit po file

The current diff very large and hard to read or review(e.g. r35966):
% svn diff -c 35966 | diffstat
 es.po | 5255 ++++++++++++++++++++++++++++++++++++++----------------------------
 1 file changed, 3047 insertions(+), 2208 deletions(-)

If we strip location:
% diff es-r31547.po.no es-r35966.po.no | diffstat
 unknown | 1804 +++++++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 1280 insertions(+), 524 deletions(-)

As we can see, the diff much smaller(5255 => 1804) and clear.

So I suggest we sort by file, and strip string locations before commit po file:

    msgcat --width=80 --sort-by-file -o tmp.po xx.po
    msgcat --width=80 --no-location -o xx.po tmp.po
    rm tmp.po

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Dongsheng Song
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