Logging of custom fields on a multilingual installation does not work, which makes it impossible to view changes if one of the changes is a custom field.

Steps to reproduce:

1. install a fresh CiviCRM installation: 5.0 (the issue also existed in versions before)
2. enable Multiple Languages Support on http://example.org/civicrm/admin/setting/localization?reset=1
3. enable logging on http://example.org/civicrm/admin/setting/misc?reset=1
4. change a custom field of a contact
5. view the changelog of that contact and click on the change

This results in follwing Database error:

Database Error Code: Table 'databasename.log_civicrm_custom_group_en_US' doesn't exist, 1146 Additional Details: Array ( [callback] => Array ( [0] => CRM_Core_Error [1] => handle )

[code] => -18
[message] => DB Error: no such table
[mode] => 16
[debug_info] => SELECT id, title FROM `databasename`.log_civicrm_custom_group_en_US WHERE log_date <= '2018-04-09 17:40:29' AND table_name = 'civicrm_value_constituent_information_1' ORDER BY log_date DESC LIMIT 1 [nativecode=1146 ** Table 'databasename.log_civicrm_custom_group_en_US' doesn't exist]
[type] => DB_Error
[user_info] => SELECT id, title FROM `databasename`.log_civicrm_custom_group_en_US WHERE log_date <= '2018-04-09 17:40:29' AND table_name = 'civicrm_value_constituent_information_1' ORDER BY log_date DESC LIMIT 1 [nativecode=1146 ** Table 'databasename.log_civicrm_custom_group_en_US' doesn't exist]
[to_string] => [db_error: message="DB Error: no such table" code=-18 mode=callback callback=CRM_Core_Error::handle prefix="" info="SELECT id, title FROM `databasename`.log_civicrm_custom_group_en_US WHERE log_date <= '2018-04-09 17:40:29' AND table_name = 'civicrm_value_constituent_information_1' ORDER BY log_date DESC LIMIT 1 [nativecode=1146 ** Table 'databasename.log_civicrm_custom_group_en_US' doesn't exist]"]

)

I replaced the actual database name with 'databasename' in the error message above