Only messages for now, executable names and other file names
can be changed later if necessary and safe.
Do not do an all-sweeping change. Some occurences of Bitcoin-Qt need to
be kept:
- Applicationname: this is used to determine the registry entry names,
we don't want to lose settings over a silly name change.
- Where it refers to the executable name instead of the product name.
- this change allows us to keep the translation without the need to
re-translate any string, when we update the copyright year
- copyright symbol is changed to HTML to ensure we get no encoding
issues and it's removed from the translation string so translators don't
break it by mistake
- add a new label, which can be updated independently from the whole
license information stuff
- the benefit is, we don't need to re-translate that whole wall of text
every year the copyright info changes
- update to the same copyright string we use in the source and in the
bitcoin-qt.exe meta-data information
- removes an obsolete entry from the ui-file
