Add accessibility translations

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

.tx/config

@@ -127,3 +127,9 @@ file_filter = translationfiles/<lang>/workflowengine.po
 source_file = translationfiles/templates/workflowengine.pot
 source_lang = en
 type = PO
+
+[nextcloud.accessibility]
+file_filter = translationfiles/<lang>/accessibility.po
+source_file = translationfiles/templates/accessibility.pot
+source_lang = en
+type = PO