Updated .pot file
Updated translations.
Removed languages that were less than 50% translated.
Merge pull request #1718 from Yoast/stories/AM/check_for_conflicting_plugins

check for conflicting open graph plugins [#80323722]
Consistent labels
fix xml sitemap typo

'Exclude userroles' => 'Exclude user roles'
Lowercase "title"
Merge similar translation strings

we use "Page Not Found" in "inc/class-wpseo-options.php:1547"
and 
we use "Page not found" in "frontend/class-frontend.php:452"


If merged those two similar string, we will make it easier for the translations teams and decrease the .MO/.PO file size.
Merge similar strings

"Meta keywords"
admin/pages/metas.php:140

"Meta Keywords"
admin/class-metabox.php:62
admin/class-taxonomy.php:181
Merge similar strings

Meta description:
admin/pages/metas.php:138

Meta Description:
admin/class-metabox.php:58
Merge similar strings

Breadcrumbs title
admin/class-metabox.php:88

Breadcrumbs Title
admin/class-taxonomy.php:187
admin/pages/metas.php:143
Merge pull request #1739 from Yoast/stories/AM/check_for_conflicting_plugins

Check for conflicts when activating our plugin
Merge pull request #1733 from ramiy/patch-4

Merge similar strings - Page not found
Merge pull request #1737 from ramiy/patch-8

Merge similar strings - Breadcrumbs Title
Merge pull request #1735 from ramiy/patch-6

Merge similar strings - Meta Description
Merge pull request #1734 from ramiy/patch-5

Merge similar strings - Meta Keywords
Merge pull request #1732 from ramiy/patch-3

Lowercase "title"
Merge pull request #1731 from ramiy/patch-2

Fix xml sitemap user roles typo
Merge pull request #1730 from ramiy/patch-1

Consistent feed labels
Merge branch 'trunk' into stories/AM/check_for_conflicting_xmlplugins