Improve title wrap on the tag page

[chengzhanhong]

I found a problem if a title is very long on the tag page.
Suggest to change the flowing two lines to white-space: normal;

tale/_sass/tale/_tags.scss

Line 60 in de5cd20

white-space: nowrap;

tale/_sass/tale/_tags.scss

Line 75 in de5cd20

white-space: nowrap;

The effect after the change can be found here