Slider Text & Translation Font

AN UPDATE!
I removed the following code from my child css:

/*CHANGE Slider Text Font Size
--------------------------------------------          */
/* Title text */
.carousel-caption h1 {
font-size:      4em;
}
:lang(el) .carousel-caption h1 {
font-size:      3.5em;
}
/* Button text */
.carousel-caption .btn {
font-size:      1em;
color:          white;
}

And the SLIDER issue got fixed!

HOWEVER!!!

I CAN NOT FIND THE TYPOGRAPHY MENU in the Customizr menu anymore!!!
The one where we would select the size and colour of H1, H2 etc…
ONLY the Google Fonts selection!
What has happened!!!!????

This means 2 things!
1 – When I select Open Sans for the site the translation pages are missing characters, and when I insert the following code:

/*Change Translated Pages font to Century Gothic
---------------------------------------------------------------          */
:lang(el) {
font-family: Century Gothic;
}
:lang(el) .navbar .nav>li>a {
font-family: Century Gothic;
}
.btt-arrow {
    font-family: FontAwesome;
}

in my child css it doesw NOT work anymore and the font in the polylalng translated pages changes to some weird Serif font as I described in my previous post!

Finally, I checked my cPanel uner child theme and there was an error log with the following:
“[01-Mar-2016 07:38:45 America/New_York] PHP Fatal error: Call to undefined function add_filter() in /newhome/eqnoieyt/public_html/wp-content/themes/customizr-child/functions.php on line 8”

This is the code that this refers to:

// ====================================================================================================================
// CHANGE the Post Title Tag to h2
// ====================================================================================================================
add_filter('tc_content_title_tag' , 'my_title_tag');
function my_title_tag() {
    return 'h2';
}

Therefore all my Page & Post titles are now a different colour & size…

Please help!!!
What has happened with Typography in general ????

Many many thanks!!