Fixes related Posts functions

Fixes function not showing "No related posts Yet!" message.
Merge pull request #150 from nauweb/master

Small fix to "Related Posts" function
Update library/less/mixins.less

Fixed typo in gradient mixin.
Update library/scss/_mixins.scss

Fixed typo in gradient mixin.
Merge pull request #170 from dhruv-bhatia/patch-1

Corrected simple mixin comment typo
Fix typos in comments
Fix typos in comments
Fix typos in comments
Fix typos in comments
Fix typos in comments
Fix typos in comments
Update library/js/scripts.js
Updated German and Default Language Files

Signed-off-by: Timo Burmeister <awesome.medi@gmail.com>
Merge pull request #179 from maxlapides/master

Bunch of typo fixes in comments
Custom slugs on custom categories

Line 88 - Added url rewrite option / custom slug to register_taxonomy
Merge pull request #181 from timoburmeister/german-trans-patch

Updated German and Default Language Files
Merge pull request #183 from paulburgess/master

Custom slugs on custom categories
added Polish translation files
Merge pull request #189 from webmonsters/master

Translation
Update archive.php