Update pull_refresh_strings.xml

It's small tweak, to make it more like gmail text assets. Previous version 'pociągnij' is considered offensive in polish language.
add pull_refresh_strings.xml in values-zh-rTW
Merge pull request #257 from fada21/patch-1

Update pull_refresh_strings.xml in values-pl
Merge pull request #270 from youngj523/master

add pull_refresh_strings.xml in values-zh-rTW