Revert "Exclude unlicencied audios from exports"

This reverts commits 09f39fd
and 63c3170.

The rationale behind the original change was that audio that cannot
be reused outside Tatoeba don’t need to be exported, but I didn’t
think about reusing the metadata instead. It turns out I broke
some of our members’ workflow, so I’m reverting.

Solves #2955.

docs/database/scripts/weekly_exports.sql

@@ -94,7 +94,6 @@ INTO OUTFILE '/var/tmp/sentence_comments.csv';
 -- Sentences with audio
 SELECT a.sentence_id, a.id, u.username, u.audio_license, u.audio_attribution_url
 FROM audios a LEFT JOIN users u on u.id = a.user_id
-WHERE u.audio_license <> ''
 ORDER BY sentence_id ASC
 INTO OUTFILE '/var/tmp/sentences_with_audio.csv';
 

src/Template/Pages/downloads.ctp

@@ -469,9 +469,9 @@ $transcriptionsOptions = $this->Downloads->createOptions('transcriptions');
                         <?= __(
                             'Contains the ids of the sentences, in all languages, for '.
                             'which audio is available. Other fields indicate who recorded '.
-                            'the audio, its license and a URL to attribute the author. '.
-                            'Note that some of the audio available on Tatoeba are not listed '.
-                            'in this file because of license restrictions.'
+                            'the audio, its license and a URL to attribute the author. If '.
+                            'the license field is empty, you may not reuse the audio '.
+                            'outside the Tatoeba project.'
                         ) ?>
                     </dd>
                     <dt><?= __('Downloading audio') ?></dt>