php - What RewriteRule shall I add to my existing rules to fix this? -

my page has 2 languages (in near future 3). has structure on inner pages:

domain.com/en/page (where page page.php in main root) 

and main page can accessed through domain.com or domain.com/en/

in server have files in main root, , 1 folder named articles, inside there other files.

when access index of folder articles index domain.com/en/articles ok.

but when access domain.com/articles takes me 404 page.

how can still open folder without /en/ or /el/ in front of it?

rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d  rewriterule ^(en|el)/articles$ articles/index.php?lang=$1 [nc]  rewriterule ^(en|el)(/)?$ index.php?lang=$1 [nc,l]  rewriterule ^(en|el)/(.*)?$ $2.php?lang=$1 [nc,l]  rewriterule ^([^\.]+)$ $1.php [nc,l] 

also, because new in htaccess please take @ overall code , tell me improvements.

you can have rules this:

rewriterule ^articles/?$ articles/index.php [nc,l]  rewriterule ^(en|el)/articles$ articles/index.php?lang=$1 [nc,l,qsa]  rewriterule ^(en|el)/?$ index.php?lang=$1 [nc,l,qsa]  rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule ^(en|el)/(.+)$ $2.php?lang=$1 [nc,l,qsa]