Break words only in tables to avoid break words for whole post body.

[Haocen]

No description provided.

[Haocen]

This is just a temporary fix.
To fix the overflow problem once and for all:

1. All elements that is possible to flow should have overflow-x: auto; applied to its parent. This require modifying the post.swig template to wrap these elements up, may cause other problems.
2. To ensure robust there should be JavaScript dynamically apply overflow-x: auto; to elements that overflow the width of the device.

[iissnan]

Thanks. 👍