Bug reason
==========

New inventory items get names like "New Script", "New Undershirt" etc., but the names are translated on-the-fly (see EXT-5839), so the user actually sees "Nouveau script", "Nouveau débardeur" etc., respectively.
However when the user changes viewer language, the old localized names still exist in the inventory cache, so, for example, if you create an undershirt in French and then switch to Enlgish, the undershirt will be named "Nouveau d bardeur", which is the old cached localized name with non-ASCII characters replaced with spaces.

Fix
===

To get rid of obsolete translations I clear all caches whenever viewer language gets changed.

Other changes
=============

- Added a check for agent region being NULL to LLAgentLanguage::update().
- Removed LLAgentLanguage constructor and base classes because it's never instantiated.

Reviewed by Seraph at https://codereview.productengine.com/secondlife/r/744/

--HG--
branch : product-engine

ignore-dead-branch

svn merge -r 121797:121853 svn+ssh://svn.lindenlab.com/svn/linden/branches/merge-event-system-7

svn merge -r114679:114681 svn+ssh://svn.lindenlab.com/svn/linden/branches/event-system/event-system-7 svn+ssh://svn.lindenlab.com/svn/linden/branches/event-system/event-system-8

Result of svn merge -r107256:107258 svn+ssh://svn/svn/user/phoenix/license_2009_merge into trunk. QAR-1165

QAR-1018 Lightweight Windows Setup App (windows-setup-3). svn merge -r102882:102883  svn+ssh://svn.lindenlab.com/svn/linden/branches/windows-setup/windows-setup-3-merge

svn merge -r 79616:82632 svn+ssh://svn/svn/linden/branches/maintenance/maintenance-7 into release
svn merge -r 83211:87215 svn+ssh://svn/svn/linden/branches/php-framework-3 into release

ACTUAL MERGE: svn merge -r 87631:87698  svn+ssh://svn/svn/linden/qa/combo-merge-maintenance-7-php-framework-3 into release

dataserver-is-deprecated

Result of svn merge -r71162:71205 svn+ssh://svn/svn/linden/branches/new-license into release. only changes files which are not deployed or the comments section of code.