Try something like:
RewriteEngine On
RewriteCond %{THE_REQUEST} \ /+\?f=([^\ &]+)
RewriteRule ^ /%1? [L,R]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{DOCUMENT_ROOT}/galleries%{REQUEST_URI} -d
RewriteRule ^(.*)$ /?f=$1 [L]
There may be some encoding issues related to the spaces in your folder names, so you may either need some combination of the NE
or B
flags in side the brackets.