Merge pull request #44 from l/translation_ja

core: update Japanese translations
doc: update Japanese auto-generated files
core: fix alignment of lines in merged buffers (closes #43)

The bug happened when options weechat.look.prefix_align and
weechat.look.prefix_buffer_align are set to "none".
core: fix reset of attributes in bars when "resetcolor" is used (closes #41)
exec: fix typo in /help exec
irc: add support of "away-notify" capability (closes #12)
irc: allow "$ident" in option irc.network.ban_mask_default (closes #18)
core: use seconds as float number for delay in command /window bare <delay>
core: fix refresh of bar item "buffer_zoom" on buffer switch
core: add non-active merged buffers with activity in hotlist (if another merged buffer is zoomed) (task #12845)

There was a bug with "num_displayed" in buffers when they are merged and
that one buffer is zoomed: now the num_displayed is > 0 for the active buffer,
and it is set to 0 for all merged non-active buffers (only in case of zoom).

A variable "zoomed" has been added in buffers to know if a buffer with this
number is zoomed or not (possibly another buffer).
core: don't remove a buffer from hotlist if it's not visible (another merged buffer is zoomed)
trigger: add filter in trigger monitor buffer

The filter can be set with /trigger monitor <filter> or by entering data
in the trigger monitor input.
core: fix typo in a French translation
core: add default key alt-'-' to toggle filters in current buffer (closes #17)
doc: update style for keys in docs
core: use an integer for seconds in command /window bare <delay>
script: add commas in title of script buffer
trigger: add a comma in title of trigger monitor buffer
core: update German translation
doc: update German auto-generated files