STORM-156 FIXED Increased "Add Friend" button width. Disabled owerflow button resizing to get more space for other buttons.

Removed commented out button and extra layout stack from panel_group_info_sidetray.xml
Resized buttons to use remaining free space when Create Group button is invisible.

Removed unused code and xml data which were once used for date in status bar.

The fix consists of two parts:
1. Saving/restoring scrollbar position when refreshing the clothing/attachments/bodyparts lists
   (the lists get refreshed on COF change).
2. Not resetting expanded accordion tab upon wearing an item (which was introduced with the fix of EXT-8164).

So, apart from preserving scrollbar position (which is what the bug reporter requests),
I also fixed that when you wear something, the Clothing accordion was always expanded.

Added polish language to list of languages that use months and days names from localized xmls.
It solved the problem of accented Polish characters "approximation" to their ASCII brethren on non-Polish Windows locales. Now all accented symbols look right.

The crash was caused by erroneous getting of month name from vector with week day names in LLStringUtil::formatDatetime().
This code woth introduced in June, so though it didn't work properly, it didn't cause the crash(cause June is 5th month). But when
number of current month exceeded number of days in week(this happened in August cause it is 8th) code started getting 8th element from
vector with 7. This caused the crash. It reproduced only on Japanese locale because only there code that caused it was used(see STORM-177
for details). This changeset seems to fix STORM-177 too.

- Used vector with months names where it should be.

STORM-186 FIXED The "Take Off - Remove from current outfit" option of the My Outfits gear menu now ignores item selection, taking aff all wearables.

STORM-183 FIXED The "Replace Current Outfit" option of the My Outfits gear menu (which is only applicable to outfits) wasn't disabled for selected wearables.

Changed some of context menu actions availability checks to be applied to all selected items instead of only the last one.

Made sure that a tab can only be highlighted when sidebar is expanended.