Replace references to WollMux in user-visible strings

[kelemeng]

There are still some user visible instances when the LOTS extension refers to itself as WollMux. These could be changed to LOTS for consistency.
For example:

• In the extension description text (source file: oxt/src/main/oxt/help/component_en.txt ), and in the sidebar when there is no Wollmux-Config found:
  
• in the error/warning/info message box title
  

[kelemeng]

Also View - Toolbars - the 3 ... (WollMux) toolbars.