Refactor Browse string to Choose File

Browse is not part of the Wordpress translatation file so it doesn't get
translated. Choose File is and will be translated according to the
langauge Wordpress is set.

Signed-off-by: Roi Dayan <[email protected]>

Author: roidayan

src/class.settings-api.php

@@ -345,7 +345,7 @@ function callback_file( $args ) {
         $id = $args['section']  . '[' . $args['id'] . ']';
 
         $html  = sprintf( '<input type="text" class="%1$s-text wpsa-url" id="%2$s[%3$s]" name="%2$s[%3$s]" value="%4$s"/>', $size, $args['section'], $args['id'], $value );
-        $html .= '<input type="button" class="button wpsa-browse" value="'.__( 'Browse' ).'" />';
+        $html .= '<input type="button" class="button wpsa-browse" value="' . __( 'Choose File' ) . '" />';
         $html .= $this->get_field_description( $args );
 
         echo $html;