More bugs fixed, thanks to Piter01: :-)

More bugs fixed, thanks to Piter01: :-)
- Non-loading language strings in transfer extension and maybe more, we used a
  deprecated way of checking "if extension foo is not installed AND if there is
  no admin". The 2nd part of the AND statement is deprecated and now removed.
- In Update notes the constants POINTS and PATH are now included dynamically
  by {!CONSTANT!}.