Use plugin specific function names

PLUGIN: yoast-seo-fix-for-qtranslate
VERSION: All (including v1.2.1)

1. Please change your function names to something unique – to avoid running into error “function already exists”:
function qtranslate_filter($title)

2. And since both functions share same parameters, priority – you can use same function for all:

function ysffq_qtranslate_filter($text){
	return __($text);
}
add_filter('wpseo_title',           'ysffq_qtranslate_filter', 10, 3);
add_filter('wpseo_metadesc',        'ysffq_qtranslate_filter', 10, 3);
add_filter('wpseo_metakey',         'ysffq_qtranslate_filter', 10, 3);
add_filter('wpseo_opengraph_title', 'ysffq_qtranslate_filter', 10, 3);

https://www.ads-software.com/plugins/yoast-seo-fix-for-qtranslate/