Theme Check Plugin

I performed a “Theme Check” plugin and received pages of potential errors. WHat is the best way to fix these…

One or more errors were found for Highend.

REQUIRED:.bypostauthor css class is needed in your theme css.
RECOMMENDED: Text domain problems in edit_custom_walker.php. You have not included a text domain!
Line 128: ?>’><?php _e( ‘Edit Menu Item’ ); ?>
Line 137: <?php _e( ‘URL’ ); ?><br />
Line 144: <?php _e( ‘Navigation Label’ ); ?><br />
Line 150: <?php _e( ‘Title Attribute’ ); ?><br />
Line 157: <?php _e( ‘Open link in a new window/tab’ ); ?>
Line 162: <?php _e( ‘CSS Classes (optional)’ ); ?><br />
Line 168: <?php _e( ‘Link Relationship (XFN)’ ); ?><br />
Line 174: <?php _e( ‘Description’ ); ?><br />
Line 176: <span class=’description’><?php _e(‘The description will be displayed in the menu if the current theme supp
Line 185: <?php _e( ‘Menu Icon’ ); ?> : Choose an Icon from Highend > Icon Manager.<br />
Line 267: <?php printf( __(‘Original: %s’), ‘url ) . ”>’ . esc_html(
Line 280: ); ?>’><?php _e(‘Remove’); ?> <span class=’meta-sep’> | </span> <a class=’item-cance
Line 281: ?>#menu-item-settings-<?php echo $item_id; ?>’><?php _e(‘Cancel’); ?>
WARNING: The theme uses the add_shortcode() function. Custom post-content shortcodes are plugin-territory functionality.
WARNING: Found wrong tag, remove responsive from your style.css header.
WARNING: Found wrong tag, remove page-builder from your style.css header.
WARNING: Found wrong tag, remove multi-purpose from your style.css header.
WARNING: Found wrong tag, remove multi-color from your style.css header.
WARNING: Found wrong tag, remove modern from your style.css header.
WARNING: Found wrong tag, remove mobile from your style.css header.
WARNING: Found wrong tag, remove drag&drop from your style.css header.
WARNING: Found wrong tag, remove corporate from your style.css header.
WARNING: Found wrong tag, remove clean from your style.css header.
WARNING: Found wrong tag, remove business from your style.css header.
WARNING: Found base64_encode in the file OAuth.php. base64_encode() is not allowed.
Line 118: return base64_encode(hash_hmac(‘sha1’, $base_string, $key, true));
Line 198: return base64_encode($signature);
WARNING: Found base64_decode in the file OAuth.php. base64_decode() is not allowed.
Line 202: $decoded_sig = base64_decode($signature);
WARNING: fread was found in the file importer.php File operations should use the WP_Filesystem methods instead of direct PHP filesystem calls.
Line 362: $content .= fread( $slider_export, 1024 );
Line 366: $animations .= fread( $custom_animations, 1024 );
Line 370: $dynamic .= fread( $dynamic_captions, 1024 );
Line 374: $static .= fread( $static_captions, 1024 );
WARNING: fread was found in the file importer.php File operations should use the WP_Filesystem methods instead of direct PHP filesystem calls.
Line 283: while (!feof($slider_export)) $content .= fread($slider_export, 1024);
Line 288: if($custom_animations){ while (!feof($custom_animations)) $animations .= fread($custom_animations, 1024); }
Line 289: if($dynamic_captions){ while (!feof($dynamic_captions)) $dynamic .= fread($dynamic_captions, 1024); }
Line 290: if($static_captions){ while (!feof($static_captions)) $static .= fread($static_captions, 1024); }
WARNING: fopen was found in the file parsers.php File operations should use the WP_Filesystem methods instead of direct PHP filesystem calls.
Line 415: $fp = $this->fopen( $file, ‘r’ );
Line 641: function fopen( $filename, $mode = ‘r’ ) {
Line 644: return fopen( $filename, $mode );
WARNING: fopen was found in the file importer.php File operations should use the WP_Filesystem methods instead of direct PHP filesystem calls.
Line 207: $src = fopen( $d_url, ‘r’ );
Line 208: $dest = fopen( $url, ‘w’ );
Line 220: $src = fopen( $d_url, ‘r’ );
Line 221: $dest = fopen( $url, ‘w’ );
Line 231: $src = fopen( $d_url, ‘r’ );
Line 232: $dest = fopen( $url, ‘w’ );
Line 242: $src = fopen( $d_url, ‘r’ );
Line 243: $dest = fopen( $url, ‘w’ );
Line 253: $src = fopen( $d_url, ‘r’ );
Line 254: $dest = fopen( $url, ‘w’ );
Line 264: $src = fopen( $d_url, ‘r’ );
Line 265: $dest = fopen( $url, ‘w’ );
Line 275: $src = fopen( $d_url, ‘r’ );
Line 276: $dest = fopen( $url, ‘w’ );
Line 286: $src = fopen( $d_url, ‘r’ );
Line 287: $dest = fopen( $url, ‘w’ );
Line 296: $src = fopen( $d_url, ‘r’ );
Line 297: $dest = fopen( $url, ‘w’ );
Line 306: $src = fopen( $d_url, ‘r’ );
Line 307: $dest = fopen( $url, ‘w’ );
Line 316: $src = fopen( $d_url, ‘r’ );
Line 317: $dest = fopen( $url, ‘w’ );