Field from default language should be valid for all languages

Question

I'm using this bit of Typoscript and a Templavoilà Plus input field to generate some text.

10 = TEXT
10.value.field = field_test

I work with English (default) and German contents. When I translate a content to German, the backend user has to fill in again field_test, which is the normal behaviour.

Modifying the Typoscript, how can I only use the English (default) content of the field_test even in the German content?

Put in other words, how can I get the value of a field of a particular language?

I saw LLL: and l10n_mode, can they be of any help? And if so, how can you use them in that case?

Is it even possible to achieve that with a simple Header of a tt_content?

Or could I use something like that to disable localisation of a single Templavoilà field ?

config.sys_language_softExclude = tt_content:subheader
config.sys_language_softMergeIfNotBlank = tt_content:subheader

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The reason why I'm asking this, is because it would be quite useful not to have to fill in again TV fields for links or images for example…

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Here is my Typoscript, where field_test is created with Templavoilà and filled in by an backend editor:

  5 = IMAGE
  5 {
    if.isTrue.field = field_test
    file = fileadmin/icons/test.png
    wrap = <li>|</li>  

    imageLinkWrap = 1
    imageLinkWrap.enable = 1
    imageLinkWrap.typolink.parameter.field = field_test
    }

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I have tried modifying the Data Structure XML as follow, but even though I have no content in the German field_test, it doesn't display the Default/English content.

<meta type="array">
 <langDisable>1</langDisable>
 <langChildren>1</langChildren>
</meta>
…
<field_test type="array">
 <tx_templavoilaplus type="array">
 <title>Test</title>
 <langOverlayMode>ifBlank</langOverlayMode>
 …
</field_test>

Answer 1

A complete guess, maybe insertData = 1 helps out??

  5 = IMAGE
  5 {
    if.isTrue.field = field_test
    file = fileadmin/icons/test.png
    wrap = <li>|</li>  

    imageLinkWrap = 1
    imageLinkWrap.enable = 1
    imageLinkWrap.insertData = 1
    imageLinkWrap.typolink.parameter.field = field_test
    }