Make template.js smaller Currently: 1.2MB

Hi @dagmar, thank you for your feature request!

The size of the file is huge, unfortunately. We were faced with the problem of how to make icons available to users. Through the build process, the icons are included in the file. So if a user wanted to use their icons, they would have to rebuild the file. We didn't want to do that.
Then we came up with the idea of including an icon set. This way, the choice for each user is huge. The advantage of the choice of icons won out over the disadvantage of the file size.

You are right about the license. GPL v2 is not fully compatible with the Apache 2 license!

What would you prefer for a solution? A different icon set with a different/compatible license and fewer icons?

What about adding the SVG content instead of the path to an icon as part of the json?

[
    {
      "title": "Link",
      "icon": '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M8 16h8v2H8zm0-4h8v2H8zm6-10H6c-1.1 0-2 .9-2 2v16c0 1.1.89 2 1.99 2H18c1.1 0 2-.9 2-2V8l-6-6zm4 18H6V4h7v5h5v11z"/></svg>
',
      "description": "Insert a link to the Drupal CKEditor5 project site.",
      "html": "<p>Do you know this cool <a href='https://www.drupal.org/project/ckeditor5' target='_blank'>editor</a>?</p>"
    },
    {
        "title": "Simple Table",
        "icon": '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M8 16h8v2H8zm0-4h8v2H8zm6-10H6c-1.1 0-2 .9-2 2v16c0 1.1.89 2 1.99 2H18c1.1 0 2-.9 2-2V8l-6-6zm4 18H6V4h7v5h5v11z"/></svg>
',
        "description": "Insert a simple Table.",
        "html": "<table border='1'><tr><th>Header 1</th><th>Header 2</th><th>Header 3</th></tr><tr><td>Row 1, Column 1</td><td>Row 1, Column 2</td><td>Row 1, Column 3</td></tr><tr><td>Row 2, Column 1</td><td>Row 2, Column 2</td><td>Row 2, Column 3</td></tr><tr><td>Row 3, Column 1</td><td>Row 3, Column 2</td><td>Row 3, Column 3</td></tr></table>"
    }
  ]

Thank you very much, dagmar. I have implemented the functionality. This allowed us to reduce the size of the template.js to 2.06KB! Can you take a look at the branch 1.0.x-feature/3378579?