Update Simplified Chinese Translation

1.Modified some translation, to make it more formal/suitable/understandable for Chinese users.
2.According to Chinese Reading Habit: Usually, there is no "space" between characters.
For example:
We usually take "1 day ago" as "1天前", not "1 天前". The space after "1" feels a little uncomfortable/machine-generated. "1天前" feels more natural:)
Update Traditional Chinese Translation

1.Modified some translation, to make it more formal/suitable/understandable for Chinese users.
2.According to Chinese Reading Habit: Usually, there is no "space" between characters.
For example:
We usually take "1 day ago" as "1天前", not "1 天前". The space after "1" feels a little uncomfortable/machine-generated. "1天前" feels more natural:)
Update NSDateTimeAgo.strings

Some minor modification!
Merge remote-tracking branch 'origin/patch-2' into patch-1
Merge pull request #68 from jameszoh/patch-1

Update Simplified Chinese Translation: zh-Hans.lproj/NSDateTimeAgo.strings