[fix] make /stats more CSP compliant - oscar theme

Replace oscar theme's *styles* (see below) by CSP compliant implementation in
``searx/static/themes/__common__/less/stats.less`` ::

    ./oscar/stats.html:29:  <th scope="col" style="width:20rem;">{{ th_sort('name', _("Engine name")) }}</th>
    ./oscar/stats.html:30:  <th scope="col" style="width:7rem; text-align: right;">{{ th_sort('score', _('Scores')) }}</th>
    ./oscar/stats.html:33:  <th scope="col" style="text-align: right;">{{ th_sort('reliability', _('Reliability')) }}</th>
    ./oscar/stats.html:38:  <td style="text-align: right;">
    ./oscar/stats.html:91:  <td style="text-align: right;"> {{ engine_reliabilities.get(engine_stat.name, {}).get('reliablity') }}</td>
    ./oscar/stats.html:109: <tbody style="padding-top: 1rem;">
    ./oscar/stats.html:112: <th scope="row" style="width: 10rem">{{ _('Exception') }}</th><td>{{ error.exception_classname }}</td>
    ./oscar/stats.html:114: <th scope="row" style="width: 10rem">{{ _('Message') }}</th><td>{{ error.log_message }}</td>
    ./oscar/stats.html:116: <th scope="row" style="width: 10rem">{{ _('Percentage') }}</th><td style="width: 10rem">{{ error.percentage }}</td>
    ./oscar/stats.html:121: <span style="border-right: 1px solid gray; padding: 0 1rem 0 0; margin: 0 0 0 0.5rem;">{{ param }}</span>
    ./oscar/stats.html:138: <th scope="col" style="width: 10rem">{{ _('Failed test') }}</th>

Reported-by: https://github.com/searxng/searxng/issues/57
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/templates/oscar/stats.html

@@ -24,18 +24,18 @@
                         {% include 'oscar/messages/no_data_available.html' %}
                     </div>
                 {% else %}
-                    <table class="table table-hover table-condensed table-striped">
+                    <table class="table table-hover table-condensed table-striped engine-stats">
                         <tr>
-                            <th scope="col" style="width:20rem;">{{ th_sort('name', _("Engine name")) }}</th>
-                            <th scope="col" style="width:7rem; text-align: right;">{{ th_sort('score', _('Scores')) }}</th>
-                            <th scope="col">{{ th_sort('result_count', _('Result count')) }}</th>
-                            <th scope="col">{{ th_sort('time', _('Response time')) }}</th>
-                            <th scope="col" style="text-align: right;">{{ th_sort('reliability', _('Reliability')) }}</th>
+                            <th scope="col" class="engine-name">{{ th_sort('name', _("Engine name")) }}</th>
+                            <th scope="col" class="engine-scores">{{ th_sort('score', _('Scores')) }}</th>
+                            <th scope="col" class="result-count">{{ th_sort('result_count', _('Result count')) }}</th>
+                            <th scope="col" class="response-time">{{ th_sort('time', _('Response time')) }}</th>
+                            <th scope="col" class="engine-reliability">{{ th_sort('reliability', _('Reliability')) }}</th>
                         </tr>
                         {% for engine_stat in engine_stats.get('time', []) %}
                         <tr>
-                            <td><a href="{{ url_for('stats', engine=engine_stat.name|e) }}">{{ engine_stat.name }}</a></td>
-                            <td style="text-align: right;">
+                            <td class="engine-name"><a href="{{ url_for('stats', engine=engine_stat.name|e) }}">{{ engine_stat.name }}</a></td>
+                            <td class="engine-scores">
                                 {%- if engine_stat.score -%}
                                 <span aria-labelledby="{{engine_stat.name}}_score" >{{ engine_stat.score|round(1) }}</span>
                                 <div class="engine-tooltip text-left" role="tooltip" id="{{engine_stat.name}}_score">{{- "" -}}
@@ -43,7 +43,7 @@
                                 </div>
                                 {%- endif -%}
                             </td>
-                            <td>
+                            <td class="result-count">
                                 {%- if engine_stat.result_count -%}
                                 <div class="bar-chart-value">{{- engine_stat.result_count | int -}}</div>{{- "" -}}
 				<div class="bar-chart-graph" aria-hidden="true">
@@ -51,7 +51,7 @@
 				</div>
                                 {%- endif -%}
                             </td>
-                            <td>
+                            <td class="response-time">
                                 {%- if engine_stat.total -%}
                                 <div class="bar-chart-value">{{- engine_stat.total | round(1) -}}</div>{{- "" -}}
 				<div class="bar-chart-graph" aria-labelledby="{{engine_stat.name}}_time" aria-hidden="true">
@@ -88,7 +88,7 @@
                                 </div>
                                 {%- endif -%}
                             </td>
-                            <td style="text-align: right;"> {{ engine_reliabilities.get(engine_stat.name, {}).get('reliablity') }}</td>
+                            <td class="engine-reliability"> {{ engine_reliabilities.get(engine_stat.name, {}).get('reliablity') }}</td>
                         </tr>
                         {% endfor %}
                     </table>
@@ -105,20 +105,20 @@
                             {% set ns.first = false %}
                             <h3>{% if secondary %}{{ _('Warnings') }}{% else %}{{ _('Errors and exceptions') }}{% endif %}</h3>
                         {% endif %}
-                        <table class="table table-striped table-bordered">
-                            <tbody style="padding-top: 1rem;">
+                        <table class="table table-striped table-bordered engine-error">
+                            <tbody>
                                 <tr>
                                     {%- if error.exception_classname -%}
-                                        <th scope="row" style="width: 10rem">{{ _('Exception') }}</th><td>{{ error.exception_classname }}</td>
+                                        <th scope="row" class="engine-error-type">{{ _('Exception') }}</th><td>{{ error.exception_classname }}</td>
                                     {%- elif error.log_message -%}
-                                        <th scope="row" style="width: 10rem">{{ _('Message') }}</th><td>{{ error.log_message }}</td>
+                                        <th scope="row" class="engine-error-type">{{ _('Message') }}</th><td>{{ error.log_message }}</td>
                                     {%- endif -%}
-                                    <th scope="row" style="width: 10rem">{{ _('Percentage') }}</th><td style="width: 10rem">{{ error.percentage }}</td>
+                                    <th scope="row" class="engine-error-type">{{ _('Percentage') }}</th><td class="engine-error-type">{{ error.percentage }}</td>
                                 </tr>
                                 {% if error.log_parameters and error.log_parameters != (None, None, None) %}<tr><th scope="row">{{ _('Parameter') }}</th>{{- '' -}}
                                     <td colspan="3">
                                         {%- for param in error.log_parameters -%}
-                                            <span style="border-right: 1px solid gray; padding: 0 1rem 0 0; margin: 0 0 0 0.5rem;">{{ param }}</span>
+                                            <span class="log_parameters">{{ param }}</span>
                                         {%- endfor -%}
                                     </td>
                                 </tr>
@@ -135,7 +135,7 @@
                 <h3>{{ _('Checker') }}</h3>
                 <table class="table table-striped table-bordered">
                     <tr>
-                        <th scope="col" style="width: 10rem">{{ _('Failed test') }}</th>
+                        <th scope="col" class="failed-test">{{ _('Failed test') }}</th>
                         <th scope="col">{{ _('Comment(s)') }}</th>
                     </tr>
                     {% for test_name, results in engine_reliabilities[selected_engine_name].checker.items() %}