Polylang helpers and translatable strings

polylang-init.php

<?php

function plang() {
	if ( function_exists('pll_current_language') )
		return pll_current_language('slug');
	else
		return 'fr';
}

function phome() {
	if ( plang() == 'fr' )
		return '/';
	else
		return '/' . plang() . '/';
}

function pl__($string) {
	if ( function_exists('pll__') )
		return pll__($string);
	else
		return $string;
}

function pl_e($string) {
	if ( function_exists('pll_e') )
		pll_e($string);
	else
		echo $string;
}

if ( function_exists('pll_register_string') ) {
	pll_register_string( 'projectname', 'A really interesting string to translate', 'projectname' );
	pll_register_string( 'projectname', 'Another one', 'projectname' );
}