diff --git a/docs/admin/engines.rst b/docs/admin/engines.rst
index 4b78c8c2b..4d1872dfc 100644
--- a/docs/admin/engines.rst
+++ b/docs/admin/engines.rst
@@ -26,6 +26,8 @@ Safe search   **SS**
 Weigth        **W**
 ------------- ----------- ---------------------------------
 Disabled      **D**
+------------- ----------- ---------------------------------
+Show errors   **DE**
 ============= =========== =================================
 
 Configuration defaults (at built time):
@@ -51,6 +53,7 @@ Configuration defaults (at built time):
         - O
 	- W
 	- D
+	- DE
 
       {% for name, mod in engines.items() %}
 
@@ -67,5 +70,6 @@ Configuration defaults (at built time):
         - {{(mod.offline and "y") or ""}}
         - {{mod.weight or 1 }}
         - {{(mod.disabled and "y") or ""}}
+        - {{(mod.display_error_messages and "y") or ""}}
 
      {% endfor %}
diff --git a/docs/admin/settings.rst b/docs/admin/settings.rst
index 2c42a21e9..2bfbae35c 100644
--- a/docs/admin/settings.rst
+++ b/docs/admin/settings.rst
@@ -175,6 +175,9 @@ Engine settings
 ``weigth`` : default ``1``
   Weighting of the results of this engine.
 
+``display_error_messages`` : default ``True``
+  When an engine returns an error, the message is displayed on the user interface.
+
 .. note::
 
    A few more options are possible, but they are pretty specific to some
diff --git a/docs/dev/engine_overview.rst b/docs/dev/engine_overview.rst
index 449c837a9..c3c81fff8 100644
--- a/docs/dev/engine_overview.rst
+++ b/docs/dev/engine_overview.rst
@@ -57,6 +57,7 @@ engine                  string      name of searx-engine
                                     (filename without ``.py``)
 shortcut                string      shortcut of search-engine
 timeout                 string      specific timeout for search-engine
+display_error_messages  boolean     display error messages on the web UI
 ======================= =========== ===========================================
 
 
diff --git a/searx/engines/__init__.py b/searx/engines/__init__.py
index 9ccef8b54..48c02e2e7 100644
--- a/searx/engines/__init__.py
+++ b/searx/engines/__init__.py
@@ -55,6 +55,7 @@ engine_default_args = {'paging': False,
                        'continuous_errors': 0,
                        'time_range_support': False,
                        'offline': False,
+                       'display_error_messages': True,
                        'tokens': []}
 
 
diff --git a/searx/results.py b/searx/results.py
index 02ab9efb1..62a01a5bd 100644
--- a/searx/results.py
+++ b/searx/results.py
@@ -346,7 +346,8 @@ class ResultContainer(object):
         return resultnum_sum / len(self._number_of_results)
 
     def add_unresponsive_engine(self, engine_name, error_type, error_message=None):
-        self.unresponsive_engines.add((engine_name, error_type, error_message))
+        if engines[engine_name].display_error_messages:
+            self.unresponsive_engines.add((engine_name, error_type, error_message))
 
     def add_timing(self, engine_name, engine_time, page_load_time):
         self.timings.append({
diff --git a/searx/static/themes/oscar/js/searx.js b/searx/static/themes/oscar/js/searx.js
index 9138576f5..c6feda50c 100644
--- a/searx/static/themes/oscar/js/searx.js
+++ b/searx/static/themes/oscar/js/searx.js
@@ -357,3 +357,13 @@ $(document).ready(function(){
         $( this ).off( event );
     });
 });
+;$(document).ready(function(){
+    $("#allow-all-engines").click(function() {
+        $(".onoffswitch-checkbox").each(function() { this.checked = false;});
+    });
+
+    $("#disable-all-engines").click(function() {
+        $(".onoffswitch-checkbox").each(function() { this.checked = true;});
+    });
+});
+
diff --git a/searx/static/themes/oscar/js/searx.min.js b/searx/static/themes/oscar/js/searx.min.js
index 4c01dca94..9c3e13b59 100644
Binary files a/searx/static/themes/oscar/js/searx.min.js and b/searx/static/themes/oscar/js/searx.min.js differ
diff --git a/searx/static/themes/oscar/js/searx_src/toggleall.js b/searx/static/themes/oscar/js/searx_src/toggleall.js
new file mode 100644
index 000000000..b6c484e3e
--- /dev/null
+++ b/searx/static/themes/oscar/js/searx_src/toggleall.js
@@ -0,0 +1,10 @@
+$(document).ready(function(){
+    $("#allow-all-engines").click(function() {
+        $(".onoffswitch-checkbox").each(function() { this.checked = false;});
+    });
+
+    $("#disable-all-engines").click(function() {
+        $(".onoffswitch-checkbox").each(function() { this.checked = true;});
+    });
+});
+
diff --git a/searx/templates/oscar/preferences.html b/searx/templates/oscar/preferences.html
index b03929df3..0d96ff5f2 100644
--- a/searx/templates/oscar/preferences.html
+++ b/searx/templates/oscar/preferences.html
@@ -155,6 +155,14 @@
 
                 <!-- Tab panes -->
                 <div class="tab-content">
+
+                    <div class="hide_if_nojs">
+                        <p class="text-{% if rtl %}left{% else %}right{% endif %}">
+                            <button type="button" class="btn btn-default btn-success" id="allow-all-engines">{{ _("Allow all") }}</button>
+                            <button type="button" class="btn btn-default btn-danger" id="disable-all-engines">{{ _("Disable all") }}</button>
+                        </p>
+                    </div>
+
                     {% for categ in all_categories %}
                     <noscript><label>{{ _(categ) }}</label>
                     </noscript>
@@ -174,14 +182,14 @@
                                     <th>{{ _("Avg. time") }}</th>
                                     <th>{{ _("Max time") }}</th>
                                     {% else %}
-                                    <th>{{ _("Max time") }}</th>
-                                    <th>{{ _("Avg. time") }}</th>
-                                    <th>{{ _("Time range") }}</th>
-                                    <th>{{ _("SafeSearch") }}</th>
-                                    <th>{{ _("Selected language") }}</th>
-                                    <th>{{ _("Shortcut") }}</th>
-                                    <th>{{ _("Engine name") }}</th>
-                                    <th>{{ _("Allow") }}</th>
+                                    <th class="text-right">{{ _("Max time") }}</th>
+                                    <th class="text-right">{{ _("Avg. time") }}</th>
+                                    <th class="text-right">{{ _("Time range") }}</th>
+                                    <th class="text-right">{{ _("SafeSearch") }}</th>
+                                    <th class="text-right">{{ _("Selected language") }}</th>
+                                    <th class="text-right">{{ _("Shortcut") }}</th>
+                                    <th class="text-right">{{ _("Engine name") }}</th>
+                                    <th class="text-right">{{ _("Allow") }}</th>
                                     {% endif %}
                                 </tr>
                         {% for search_engine in engines_by_category[categ] %}
@@ -256,10 +264,10 @@
                 </p>
                 <table class="table table-striped">
                     <tr>
-                        <th class="text-muted">{{ _('Name') }}</th>
-                        <th class="text-muted">{{ _('Keywords') }}</th>
-                        <th class="text-muted">{{ _('Description') }}</th>
-                        <th class="text-muted">{{ _('Examples') }}</th>
+                        <th class="text-muted{% if rtl %} text-right{% endif %}">{{ _('Name') }}</th>
+                        <th class="text-muted{% if rtl %} text-right{% endif %}">{{ _('Keywords') }}</th>
+                        <th class="text-muted{% if rtl %} text-right{% endif %}">{{ _('Description') }}</th>
+                        <th class="text-muted{% if rtl %} text-right{% endif %}">{{ _('Examples') }}</th>
                     </tr>
 
                     {% for answerer in answerers %}
@@ -285,8 +293,8 @@
                 {% if cookies %}
                 <table class="table table-striped">
                     <tr>
-                        <th class="text-muted" style="padding-right:40px;">{{ _('Cookie name') }}</th>
-                        <th class="text-muted">{{ _('Value') }}</th>
+                        <th class="text-muted{% if rtl %} text-right{% endif %}" style="padding-right:40px;">{{ _('Cookie name') }}</th>
+                        <th class="text-muted{% if rtl %} text-right{% endif %}">{{ _('Value') }}</th>
                     </tr>
 
                     {% for cookie in cookies %}
diff --git a/searx/translations/fa_IR/LC_MESSAGES/messages.mo b/searx/translations/fa_IR/LC_MESSAGES/messages.mo
index a2f503386..56c04178f 100644
Binary files a/searx/translations/fa_IR/LC_MESSAGES/messages.mo and b/searx/translations/fa_IR/LC_MESSAGES/messages.mo differ
diff --git a/searx/translations/fa_IR/LC_MESSAGES/messages.po b/searx/translations/fa_IR/LC_MESSAGES/messages.po
index 6689dafe7..28cfd1ed6 100644
--- a/searx/translations/fa_IR/LC_MESSAGES/messages.po
+++ b/searx/translations/fa_IR/LC_MESSAGES/messages.po
@@ -109,7 +109,7 @@ msgstr "توابع آماری"
 
 #: searx/answerers/statistics/answerer.py:54
 msgid "Compute {functions} of the arguments"
-msgstr "پردازش {عملکرد های} نشانوند ها<br>"
+msgstr "پردازش {functions} نشانوند ها<br>"
 
 #: searx/engines/__init__.py:194
 msgid "Engine time (sec)"
diff --git a/searx/webapp.py b/searx/webapp.py
index 8c3531069..f3f5f21b8 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -144,7 +144,7 @@ if not searx_debug \
 
 babel = Babel(app)
 
-rtl_locales = ['ar', 'arc', 'bcc', 'bqi', 'ckb', 'dv', 'fa', 'glk', 'he',
+rtl_locales = ['ar', 'arc', 'bcc', 'bqi', 'ckb', 'dv', 'fa', 'fa_IR', 'glk', 'he',
                'ku', 'mzn', 'pnb', 'ps', 'sd', 'ug', 'ur', 'yi']
 
 # used when translating category names