[fix] simple-theme templates: polish HTML <img> elements

- <img> [1] element does not have an end tag, no need for a leading `/>`
- add global attribute title[2] to result_templates/images.html (result-images-source)
- in jinja macro 'macro result_header' remove duplicate of class="image"
- in jinja macro 'macro result_header' remove alt attribute (fix [3])::

    alt="{{ result.title|striptags }}"

  the result.title is already shown in::

    <h3>{{ result_link(result.url, result.title|safe) }}</h3>

[1] https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img
[2] https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes#attr-title
[3] https://github.com/searxng/searxng/issues/523

Closes: https://github.com/searxng/searxng/issues/523
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/templates/simple/infobox.html

@@ -1,6 +1,6 @@
 <aside class="infobox">
   <h2><bdi>{{ infobox.infobox }}</bdi></h2>
-  {% if infobox.img_src %}<img src="{{ image_proxify(infobox.img_src) }}" title="{{ infobox.infobox|striptags }}" alt="{{ infobox.infobox|striptags }}" />{% endif %}
+  {% if infobox.img_src %}<img src="{{ image_proxify(infobox.img_src) }}" title="{{ infobox.infobox|striptags }}" alt="{{ infobox.infobox|striptags }}">{%- endif -%}
   <p><bdi>{{ infobox.content | safe }}</bdi></p>
   {% if infobox.attributes %}
   <div class="attributes">
@@ -8,15 +8,15 @@
     <dl>
       <dt><bdi>{{ attribute.label }} :</bdi></dt>
       {%- if attribute.image -%}
-      <dd><img src="{{ image_proxify(attribute.image.src) }}" alt="{{ attribute.image.alt }}" /></dd>
+      <dd><img src="{{ image_proxify(attribute.image.src) }}" alt="{{ attribute.image.alt }}"></dd>
       {%- else -%}
       <dd><bdi>{{ attribute.value }}</bdi></dd>
       {%- endif -%}
     </dl>
-    {% endfor %}      
+    {% endfor %}
   </div>
   {% endif %}
-  
+
   {% if infobox.urls %}
   <div class="urls">
     <ul>

searx/templates/simple/macros.html

@@ -1,6 +1,6 @@
 <!-- Draw favicon -->
 {% macro draw_favicon(favicon) -%}
-    <img width="14" height="14" class="favicon" src="{{ url_for('static', filename='themes/simple/img/icons/' + favicon + '.png') }}" alt="{{ favicon }}" />
+    <img width="14" height="14" class="favicon" src="{{ url_for('static', filename='themes/simple/img/icons/' + favicon + '.png') }}" alt="{{ favicon }}">
 {%- endmacro %}
 
 {% macro result_open_link(url, classes='') -%}
@@ -23,8 +23,8 @@
   <span class="url_o{{loop.index}}"><span class="url_i{{loop.index}}">{{- part -}}</span></span>
   {%- endfor %}
   {{- result_close_link() -}}
-  {%- if result.img_src %}{{ result_open_link(result.url) }}<img class="image" src="{{ image_proxify(result.img_src) }}" alt="{{ result.title|striptags }}" title="{{ result.title|striptags }}" class="image" />{{ result_close_link() }}{% endif -%}
-  {%- if result.thumbnail %}{{ result_open_link(result.url) }}<img class="thumbnail" src="{{ image_proxify(result.thumbnail) }}" title="{{ result.title|striptags }}" alt="{{ result.title|striptags }}"/>{{ result_close_link() }}{% endif -%}
+  {%- if result.img_src %}{{ result_open_link(result.url) }}<img class="image" src="{{ image_proxify(result.img_src) }}" title="{{ result.title|striptags }}">{{ result_close_link() }}{% endif -%}
+  {%- if result.thumbnail %}{{ result_open_link(result.url) }}<img class="thumbnail" src="{{ image_proxify(result.thumbnail) }}" title="{{ result.title|striptags }}">{{ result_close_link() }}{% endif -%}
   <h3>{{ result_link(result.url, result.title|safe) }}</h3>
 {%- endmacro -%}
 

searx/templates/simple/result_templates/images.html

@@ -1,6 +1,6 @@
 <article class="result result-images {% if result['category'] %}category-{{ result['category'] }}{% endif %}">{{- "" -}}
         <a {% if results_on_new_tab %}target="_blank" rel="noopener noreferrer"{% else %}rel="noreferrer"{% endif %} href="{{ result.img_src }}">{{- "" -}}
-                <img class="image_thumbnail" {% if results_on_new_tab %}target="_blank" rel="noopener noreferrer"{% else %}rel="noreferrer"{% endif %} src="{% if result.thumbnail_src %}{{ image_proxify(result.thumbnail_src) }}{% else %}{{ image_proxify(result.img_src) }}{% endif %}" loading="lazy" title="{{ result.title|striptags }}" alt="{{ result.title|striptags }}"/>{{- "" -}}
+                <img class="image_thumbnail" {% if results_on_new_tab %}target="_blank" rel="noopener noreferrer"{% else %}rel="noreferrer"{% endif %} src="{% if result.thumbnail_src %}{{ image_proxify(result.thumbnail_src) }}{% else %}{{ image_proxify(result.img_src) }}{% endif %}" loading="lazy" title="{{ result.title|striptags }}" alt="{{ result.title|striptags }}">{{- "" -}}
                 <span class="title">{{ result.title|striptags }}</span>{{- "" -}}
         </a>{{- "" -}}
         <div class="detail">{{- "" -}}
@@ -9,9 +9,9 @@
                 <a class="result-detail-next" href="#">{{ icon('chevron-right') }}</a>{{- "" -}}
                 <a class="result-images-source" {% if results_on_new_tab %}target="_blank" rel="noopener noreferrer"{% else %}rel="noreferrer"{% endif %} href="{{ result.img_src }}">
                         {%- if result.thumbnail_src -%}
-                                <img src="" data-src="{{ image_proxify(result.img_src) }}" alt="{{ result.title|striptags }}">
+                                <img src="" data-src="{{ image_proxify(result.img_src) }}" alt="{{ result.title|striptags }}" title="{{ result.title|striptags }}">
                         {%- else -%}
-                                <img src="{{ image_proxify(result.img_src) }}" alt="{{ result.title|striptags }}" loading="lazy">
+                                <img src="{{ image_proxify(result.img_src) }}" alt="{{ result.title|striptags }}" loading="lazy" title="{{ result.title|striptags }}">
                         {%- endif -%}
                 </a>{{- "" -}}
                 <div class="result-images-labels">{{- "" -}}