Remove "复刻" from translation option list of "fork", keeping "派生"
as the only one.
In Git context, by talking about the term "fork", one usually mean the
procedure that divides a branch into two or more history lines. That
is quite like the "fork" concept in programming, which split a process
into two or more independent processes.
On the other hand, "复刻" by itself means "copy" or "mirror". It is
considered more suitable for describing the procedure like
"fork a repository", which is common on public repository hosting
services, such as GitHub. However, this is beyond the scope of
core-Git. As a l10n work for core-Git, "复刻" should be removed here.
There used to be another option - "分岔". Its a good idea to
translate "fork point" as "分岔点". However, "派生点" is as good,
too. So this option is finally discarded.
Also fix a relevant translation issue which was introduced in
`
160fb2b`.
Signed-off-by: Ray Chen <oldsharp@gmail.com>