Typo3 7.6 Flux backend layout column title - typo3

Question

I created a basic template with the builder extension. In the page properties I set Backend layout to fuildpages and I see now in the backend the 2 columns that the builder extension created:
<f:section name="Configuration">
<flux:form id="standard">
<!-- Insert fields, sheets, grid, form section objects etc. here, in this flux:form tag -->
</flux:form>
<flux:grid>
<!-- Edit this grid to change the "backend layout" structure -->
<flux:grid.row>
<flux:grid.column colPos="0" colspan="3" name="main" />
<flux:grid.column colPos="1" name="right" />
</flux:grid.row>
</flux:grid>
</f:section>
<f:section name="Main">
<h1>I am a page template!</h1>
<p>
My template file is EXT:my_template/Resources/Private/Page/Standard.html.
</p>
<div style="float: left; width: 75%;">
<h2>Content main</h2>
<v:content.render column="0" />
</div>
<div style="float: left; width: 25%;">
<h2>Content right</h2>
<v:content.render column="1" />
</div>
</f:section>
But in the backend this columns don't have the names "main" and "right".
In typo3 6.2 this worked with the basic template the builder create. Do I miss something?
And an additional question: Is there a sysext for the default backend layout "Left" "Normal" "Right" "Border"? I wanted to watch there how it is done but I could not find it.

Answer 1

You need to set the label attribute on your <flux:grid.column/>-tags. The name attribute is only used to reference the column in other places, for example to render it using the <v:content.render/>-ViewHelper from EXT:vhs.
A note on translations of the column label: The label attribute can not contain usages of the <f:translate/>-ViewHelper, due to caching (GitHub issue). If you want to translate your column names, you need to provide the translation under some default key, which one that is is explained here.