Avoid hardcoding message HTML, use template tag for that

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/html/accounts/email.html

 {% extends "base.html" %}
 {% load url from future %}
 {% load i18n %}
+{% load translations %}
 
 {% block content %}
 
 <h2>{% trans "Register email" %}</h2>
 
 {% if form.errors %}
-<div class="ui-widget">
-    <div style="padding: 0pt 0.7em;" class="ui-state-error ui-corner-all"> 
-        <p><span style="float: left; margin-right: 0.3em;" class="ui-icon ui-icon-alert"></span>
-        {% trans "Please fix errors in registration form." %}
-        </p>
-    </div>
-</div>
+{% show_message "error" _("Please fix errors in the registration form.") %}
 {% endif %}
 
 <form action="{% url 'social:complete' "email" %}" method="post" accept-charset="utf-8">

weblate/html/accounts/login.html

 {% extends "base.html" %}
 {% load url from future %}
 {% load i18n %}
+{% load translations %}
 
 {% block content %}
 
 {% if form.errors %}
-<div class="ui-widget">
-    <div style="padding: 0pt 0.7em;" class="ui-state-error ui-corner-all"> 
-        <p><span style="float: left; margin-right: 0.3em;" class="ui-icon ui-icon-alert"></span>
-        {% trans "This username/password combination was not found. Please try again." %}
-        </p>
-    </div>
-</div>
+{% show_message "error" _("This username/password combination was not found. Please try again.") %}
 {% endif %}
 
 <h2>{% trans "Password login" %}</h2>

weblate/html/accounts/profile.html

@@ -6,13 +6,7 @@
 {% block content %}
 
 {% if form.errors or userform.errors or subscriptionform.errors %}
-<div class="ui-widget">
-    <div style="padding: 0pt 0.7em;" class="ui-state-error ui-corner-all"> 
-        <p><span style="float: left; margin-right: 0.3em;" class="ui-icon ui-icon-alert"></span>
-        {% trans "Please fix errors in the form." %}
-        </p>
-    </div>
-</div>
+{% show_message "error" _("Please fix errors in the form.") %}
 {% endif %}
 
 <form method="post" action="{% url 'profile' %}">

weblate/html/accounts/register.html

 {% extends "base.html" %}
 {% load url from future %}
 {% load i18n %}
+{% load translations %}
 
 {% block content %}
 
@@ -17,13 +18,7 @@
 <h2>{% trans "Register using email" %}</h2>
 
 {% if form.errors %}
-<div class="ui-widget">
-    <div style="padding: 0pt 0.7em;" class="ui-state-error ui-corner-all"> 
-        <p><span style="float: left; margin-right: 0.3em;" class="ui-icon ui-icon-alert"></span>
-        {% trans "Please fix errors in registration form." %}
-        </p>
-    </div>
-</div>
+{% show_message "error" _("Please fix errors in the registration form.") %}
 {% endif %}
 
 <form action="{% url 'register' %}" method="post" accept-charset="utf-8">

weblate/html/accounts/reset.html

 {% extends "base.html" %}
 {% load url from future %}
 {% load i18n %}
+{% load translations %}
 
 {% block content %}
 
@@ -9,13 +10,7 @@
 <p>{% trans "Forgotten your password? Enter your e-mail address below, and we'll e-mail instructions for setting a new one." %}</p>
 
 {% if form.errors %}
-<div class="ui-widget">
-    <div style="padding: 0pt 0.7em;" class="ui-state-error ui-corner-all"> 
-        <p><span style="float: left; margin-right: 0.3em;" class="ui-icon ui-icon-alert"></span>
-        {% trans "Please fix errors in registration form." %}
-        </p>
-    </div>
-</div>
+{% show_message "error" _("Please fix errors in the registration form.") %}
 {% endif %}
 
 <form action="{% url 'password_reset' %}" method="post" accept-charset="utf-8">