tasks #7259: Launch wiki reindex event

This task is part of story #7185

 * Rename reindex to reindexDocman
 * i18n
 * Add wiki reindex event
 * Add tests for docman reindexation

Change-Id: I1e2ee39e7879017562992e21bde80fd4843f0ef7
Merge commit 'refs/changes/96/2796/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7259: Launch wiki reindex event

Change-Id: Iea8b60380a802443af20d90e6fd6ad494c5a8e10
Tuleap 7.3.99.2

Change-Id: I2cfdccba4b2ea9b6ce5d17ead6426ae14cdc6f93