Merged languages

Merged languages from transfix.com
Merge pull request #179 from antoniypetrov/master

Merged languages and translated hardcoded phrases
Merge branch 'master' of https://github.com/simpleinvoices/simpleinvoices into master_fixes

Merged languages from transfix.com by antoniypetrov
Merge branch 'master_fixes' into custom_cz

Merged languages from transfix.com by antoniypetrov

	new file:   lang/af_ZA/info.xml
	new file:   lang/af_ZA/lang.php
	new file:   lang/ar_AR/info.xml
	new file:   lang/ar_AR/lang.php
	new file:   lang/bg_BG/info.xml
	new file:   lang/bg_BG/lang.php
	new file:   lang/en_US/info.xml
	new file:   lang/en_US/lang.php
	new file:   lang/es_MX/info.xml
	new file:   lang/es_MX/lang.php
	new file:   lang/et_EE/info.xml
	new file:   lang/et_EE/lang.php
	new file:   lang/gl_GL/info.xml
	new file:   lang/gl_GL/lang.php
	new file:   lang/hr_HR/info.xml
	new file:   lang/hr_HR/lang.php
	new file:   lang/hu_HU/info.xml
	new file:   lang/hu_HU/lang.php
	new file:   lang/id_ID/info.xml
	new file:   lang/id_ID/lang.php
	new file:   lang/pl_PL/info.xml
	new file:   lang/pl_PL/lang.php
	new file:   lang/pt_BR/info.xml
	new file:   lang/pt_BR/lang.php
	new file:   lang/sr_SR/info.xml
	new file:   lang/sr_SR/lang.php
	new file:   lang/zh_CN/info.xml
	new file:   lang/zh_CN/lang.php
	new file:   lang/zh_HK/info.xml
	new file:   lang/zh_HK/lang.php
	new file:   lang/zh_TW/info.xml
	new file:   lang/zh_TW/lang.php