Include project glossaries on branching a project

[pedro-mendonca]

Problem

When a user branches a project, the project glossaries and glossary entries aren't cloned.

Some Translation fields weren't also being cloned: (edited)

• translation_3
• translation_4
• translation_5
• user_id_last_modified

Solution

Include the project glossaries in the cloning procedure.

Fixes #1847

Notes:

• This PR fixes an old codebase for the currently unused copy_glossary_items_from(), and includes also some missing fields on the cloning method copy_translations_from().
• As this PR includes the cloning of the Translation Sets related project glossaries, I've added it inside the method copy_sets_and_translations_from() and added this info on the new docblock.
• I've called copy_glossary_items_from() inside copy_sets_and_translations_from() to avoid another DB ping to get the related translation sets. If is preferred to call the copy_glossary_items_from() directly in duplicate_project_contents_from() please let me know.