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in contenttypes.yml:
  image:
    type: image
    attrib: [ alt_nl, title_nl, alt_en, title_en, alt_fr, title_fr ]

in de template: 

{% set alt = attribute(record.values.image, 'alt_'~getlanguage() )|default('') %}
{% set title = attribute(record.values.image, 'title_'~getlanguage() )|default('') %}

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Source: https://crunchify.com/list-of-all-social-sharing-urls-for-handy-reference-social-media-sharing-buttons-without-javascript/

Facebook:

Facebook social share URL:
https://www.facebook.com/sharer.php?u=[post-url]

Twitter:

Twitter social share URL:

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{% if 'youtube' in record.video.url %}
            {% set embedurl = 'https://www.youtube-nocookie.com/embed/' ~ record.video.url|split('=')|last ~ '?feature=oembed&rel=0&autoplay=1' %}
        {% elseif 'youtu.be' in record.video.url %}
            {% set embedurl = 'https://www.youtube-nocookie.com/embed/' ~ record.video.url|split('/')|last ~ '?feature=oembed&rel=0&autoplay=1' %}
        {% elseif 'vimeo' in record.video.url %}
            {% set embedurl = 'https://player.vimeo.com/video/' ~ record.video.url|split('/')|last ~'?autoplay=1'  %}
        {% else %}
            {% set embedurl = '[todo-else]' %}
        {% endif %}
        

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.skiplinks {
    position: absolute;
    top: 3px;
    left: 10px;
    width: 100px;
    
    a {
        color: #000; // force black for optimal contrast
        font-size: 0.9167em;
        display: inline-block;

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## Debugging
# OFF on global config! - to make sure it is enabled on PROD by default.
debug:
    enabled: false
    address: [email protected]
    
    
    
# TEMPLATES
# Custom for museon site, in the museon2019/templates folder

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{% if app.request.get('_route') %}{# no route, no SEO tags #}
    <title>{{ seo.title() }}</title>
    {{ seo.metatags() }}
{% else %}
    <title>Niet Gevonden | {{ config.get('general/sitename') }}</title>
{% endif %}

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    {% if record.image is not empty %}
        <figure class="main-img">
            <div class="img-container">
                <img class="" 
                {# give the browser three possible imagesizes to choose from #}
                srcset="{{ record.image|thumbnail(1800,750,'c') }} 1800w ,
                        {{ record.image|thumbnail(1200,500,'c') }} 1200w,
                        {{ record.image|thumbnail(800,330,'c') }} 800w"
                {# give the width the image is used on different mediaqueries - in this case always 100% #}
                sizes="100vw"

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{# 
Create a user friendly 404 page that guesses the broken link by looking at the language attribute, and serving the appropriate language
#}

{# Special 404 case, no locales present: check for language #}
{% set language = getlanguage()|default(app.request.pathInfo|split("/")[1])|default('nl') %}
  

    {% if language == 'en' %}
        {% set record = record.endata|json_decode %}

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{# Checks start- and enddates and returns a pretty formatting.
# available formats:
# 14 jan 2019  (one day)
# 14 jan 2019 14:00 - 16:00  (one day but different end time)
# 14 jan 2019 - 18 jan 2019 (multiple day event)

#}


{% if item is not defined %}

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{% if item is not defined %}
    {% set item = record %}
{% endif %}

{% if item.startdate|localdate("%G%b%e") == item.enddate|localdate("%G%b%e") %} {# one day event #}
    {% if item.startdate|localdate("%k%M") == item.enddate|localdate("%k%M") %}
        {# one day, same time #}
        {{ item.startdate|localdate("%e %b %G") }} 
    {% else %}
        {# one day, start and end time #}