MT#5173 Add Polycom sync settings to config
MT#5575 Properly clear pbx audio cache for moh/pbx
MT#5575 Clear audio cache only on specific service

Use appserver for system sets and pbx for customer sets.
MT#5599 Rework auth/authz for pwd-based API access

Cleanup unnecessary realms.
Use roles instead of realms for authz.
HTTP basic auth for api access.
Use admin/reseller roles instead of api_admin/api_reseller.
Fix API::Root invalid_user detaching.
MT#5599 Define new auth module dependency.
MT#5599 API: remove middleware handling.
MT#5599 Fix pwd-based api auth.
MT#5587 Remove apache migration stuff.
config for polycom phones
MT#5629 Fix setting external_id in customer ctx.
MT#5661 Update prepaid pref on bilprof change

If prepaid flag is changed in billing profile, all subscribers
of all contracts currently having this profile are updated.

If customer changes from prepaid profile to postpaid and vice versa,
all subscribers of this contract are updated.

If subscriber is created either in subscriber or customer view,
the prepaid pref is set if billing profile of its customer is
prepaid.
MT#5661 change selection of customers when bprof is updated

only those customers which have this billing profile
currently active are considered
this concerns the change of the prepaid flag
MT#5661 API: fix prepaid flag changes.
MT#4871 fix domain test

the skip part was never executed
also make it more robust
MT#5741 Allow upperchase in subscriber username
MT#3961 Prepare for localization
MT#3961 Prepare to localize DB-Strings

For now, we ignore square brackets
provide a mechanism to update README
MT#3961 Provide Dropdown to change the language

We save this setting in a session variable and a cookie
valid for 3 months
MT#3961 more translations