translation problem

hi , i tried to translate this plugin but there is a problem within translating a part of it , i mean this line of text :
(Beta)Reduce HTTP requests through combined files
even i removed text (Beta) from admin.php but no luck
and here is my work :

also there is rtl problems in rtl formation , i resolved that by adding custome css code in style.css but i think doing this things with javascript is very easy.

https://ww.wp.xz.cn/plugins/wp-fastest-cache/