Language portugue (#1648)

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* Create folder pt-br to translate to portuguese-brazil;
Translate file admin.php;
Trnaslate file index.php;

* Translate the files:
- conf.php
- feedback.php
- gen.php

* Translate sub.php e install.php; add pt-br in file gen.php inside another languages

* fix bug

* Configure display date

* Add pt-br to es, kr, zh, and fix whitespace

https://github.com/FreshRSS/FreshRSS/pull/1648

* Changelog 1648

https://github.com/FreshRSS/FreshRSS/pull/1648

* Fix whitespace (caught by Travis)

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