title: TYPO3 Not able anymore to translate CE's to other languages
body: <p>Is there a way to 'reset' or db entries to delete or something else without deleting all content already translated... (and would that solve the issue?)</p>
  
  <p>In the first go all translation went well, I chose a 'one tree' setup pressing translate rather then copy, but adding and modifying the content over time certain elements where not available for translation anymore ...</p>
  
  <p>at one point the second step in translation asked for the origin language (if I recall well) and trying to resolve I chose another language than the default, now I do not have the choice anymore and the record summary proposes elements from german rather than from my default language (italian) which might be the problem since I can only introduce new content in the default language.</p>
  
  <p>if I try to localize from the list view clicking the language flag, in the language selection field I get <code>[INVALID VALUE("1")]</code> and as only option <code>(Default) [0]</code> to select ...</p>
  
  <p>I use <strong>TYPO3 V7.6.13</strong>, <strong>EXT:gridelements</strong> and <strong>EXT:t3sbootstrap</strong> (the nested CE's where the first to show trouble)</p>
  
  <p>content of my database table sys_language: (my default lang is italian)</p>
  
  <pre><code>uid | pid | tstamp | hidden | title   | flag |
   1     0    ...        0      English    gb
   2     0    ...        0      German     de
  </code></pre>
  
  <p>does anyone know good reference or a solution to this problem ?</p>