Fix/event date email

[mateodurante]

This pull request introduces several improvements focused on visual consistency, accessibility, and localization in reports and notification templates. The main changes include updating priority color codes, enhancing support for dark mode, improving the display of priority and TLP levels, and refining event date handling and translations.

Visual and Theming Improvements:

• Updated the color values for different priority levels in priority.json to use distinct, meaningful colors instead of white, improving clarity and visual differentiation. [1] [2] [3] [4]
• Added meta tags to base_head.html and CSS rules to email.css to support light/dark color schemes, ensuring better appearance in dark mode and consistent background for headers. [1] [2]

Report Header and Display Enhancements:

• Modified the header styles in base_header_right.html to display priority and TLP levels with a black background and the specified color for improved readability and emphasis.

Localization and Event Date Handling:

• Improved the event report template and translation files to support both event date and creation date, and added a translation for "Event creation date" to provide clearer information in reports. [1] [2]

[Copilot]

Pull request overview

This PR updates report/email templates and related localization/fixtures to improve priority/TLP visual presentation, add dark-mode signaling, and clarify event timestamp display (event date vs creation date).

Changes:

• Updated priority fixture colors to distinct values for clearer differentiation.
• Added email dark-mode meta tags and CSS overrides, and adjusted header styling for priority/TLP pills.
• Updated the basic event report to display either “Event Date” or “Event creation date”, plus added the Spanish translation entry.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
ngen/templates/reports/email.css	Adds prefers-color-scheme handling for email rendering.
ngen/templates/reports/basic_event_report.html	Shows event date if present, otherwise creation date (with translated label).
ngen/templates/reports/base_header_right.html	Improves priority/TLP pill readability with a black background.
ngen/templates/reports/base_head.html	Adds color-scheme meta tags for better dark-mode behavior in email clients.
ngen/locale/es/LC_MESSAGES/django.po	Adds Spanish translation for “Event creation date”.
ngen/fixtures/priority.json	Updates priority color values to non-white, distinct colors.

Suppressed comments (1)

ngen/templates/reports/basic_event_report.html:31

• The Notes section opens a tag but never closes it, and the {% endif %} is currently placed inside the <small> block. This produces invalid HTML and can lead to inconsistent rendering in email clients.

{% if event.notes %}
<small class="lead"><strong>{% translate 'Notes' %}:</strong>
    <div style="word-wrap: break-word;">{{ event.notes | render_report_content:event }}</div>
    <br>
    {% endif %}

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