Plugin: Improve FB login button

plugin/add_facebook_login_button/index.php

@@ -7,7 +7,7 @@ if (api_is_anonymous()) {
     require_once api_get_path(SYS_CODE_PATH)."auth/external_login/facebook.inc.php";
     $_template['show_message'] = true;
     // the default title
-    $button_url = api_get_path(WEB_PLUGIN_PATH)."add_facebook_login_button/img/cnx_fb.png";
+    $button_url = '';
     $href_link = facebookGetLoginUrl();
     if (!empty($plugin_info['settings']['add_facebook_login_button_facebook_button_url'])) {
         $button_url = api_htmlentities($plugin_info['settings']['add_facebook_login_button_facebook_button_url']);

plugin/add_facebook_login_button/template.tpl

@@ -1,5 +1,14 @@
 {% if add_facebook_login_button.show_message %}
-<a href="{{add_facebook_login_button.facebook_href_link}}">
+    <hr>
-    <img src="{{add_facebook_login_button.facebook_button_url}}" style="margin-left:15px; border-radius:0"/>
+    {% if add_facebook_login_button.facebook_button_url %}
-</a>
+        <a href="{{ add_facebook_login_button.facebook_href_link }}" title="{{ 'FacebookMainActivateTitle'|get_lang }}">
+            <img src="{{ add_facebook_login_button.facebook_button_url }}"
+                 alt="{{ 'FacebookMainActivateTitle'|get_lang }}" style="display: block; margin: 0 auto;">
+        </a>
+    {% else %}
+        <a href="{{ add_facebook_login_button.facebook_href_link }}" class="btn btn-primary btn-block">
+            <span class="fa fa-facebook fa-fw" aria-hidden="true"></span> {{ 'FacebookMainActivateTitle'|get_lang }}
+        </a>
+    {% endif %}
+    <hr style="margin-bottom: 10px;">
 {% endif %}