Create pl.lang.php

Localization: Polish(pl) translations added.
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Create pl.lang.php
Update install.php

Localization: Polish(pl) translations added.
Merge pull request #125 from mwidz/master

Localization: Polish(pl) translations added.