Single quotes

src/freedombone-app-matrix

 
     # append the matrix server to the web site config
     matrix_nginx_site=/etc/nginx/sites-available/$DEFAULT_DOMAIN_NAME
-    if ! grep -q "# End of Matrix Server" $matrix_nginx_site; then
+    if ! grep -q '# End of Matrix Server' $matrix_nginx_site; then
         if [[ $ONION_ONLY == "no" ]]; then
             echo '# Matrix Server' >> $matrix_nginx_site
             echo 'server {' >> $matrix_nginx_site

src/freedombone-utils-turn

 
     # append the matrix server to the web site config
     turn_nginx_site=/etc/nginx/sites-available/$DEFAULT_DOMAIN_NAME
-    if ! grep -q "# End of TURN Server" $turn_nginx_site; then
+    if ! grep -q '# End of TURN Server' $turn_nginx_site; then
         if [[ $ONION_ONLY == "no" ]]; then
             echo '# TURN Server' >> $turn_nginx_site
             echo 'server {' >> $turn_nginx_site