converted tabs to spaces also. but these commits is limited in the zh
the reason I did this:
- long lines is prone to conflict
- the use of tab disturbs the indentation when switching editors
without proper tab space setting, which you may never get it right.
so why not give up and use spaces instead.
those changes is limited to the zh translation.
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
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