A kludge to change the text and look of Subscribe and Unsubscribe links.

Create a module. Let's call it, er, RelNot, for relabel notifications. Also sounds like an ancient god. "RelNot is angry!"

relnot.module:

/*
 * If notifications module is active, change link text.
 */
function relnot_init() {
  if ( module_exists('notifications') ) {
    drupal_add_js( 
        drupal_get_path('module', 'relnot') 
        . '/js/relnot.js' 
    );
    drupal_add_css( 
        drupal_get_path('module', 'relnot') 
        . '/css/relnot.css' 
    );
  }
}

relnot.js:

/**
 * Change the text of notification links.
 */
(function ($) {
  Drupal.behaviors.relnot= {
    attach: function (context, settings) {
      $(".node .links").children().each( function( index, element ) {
        var a = $(element).find("a");
        if ( a.length > 0 ) {
          var linkText = a.text().toLowerCase();
          if ( linkText.substring(0, 9) == "subscribe") {
            a.text("Follow");
            a.attr("title", "Get emails about new comments on this page.");
          }
          if ( linkText.substring(0, 11) == "unsubscribe") {
            a.text("Stop following");
            a.attr("title", "Stop getting emails about new comments on this page.");
          }
        }
      });
    }
  };
}(jQuery));

relnot.css:

/*
Tweaks for the notifications module's links.
*/
.node .links {
  margin-left: 0;
}

.node .links .comment-add {
  display: none;
}

.node .links .notifications-1 {
  margin: 1.5em 1.5em 1.5em 0;
  padding: 0.4em;
  border: 1px solid #398439;
  border-radius: 4px;
  background-color: #5CB85C;
}

.node .links .notifications-1 a {
  color: white;
}

.node .links .notifications-1:hover,
.node .links .notifications-1 a:hover {
  text-decoration: none;
  background-color: #47A447;
}

These styles emulate a Bootstrap button.

If this code is useful, give your dog some extra love.