Fix missing localization

This addresses some of what's reported in ticket #14637.

* Keymap preferences: Localize key labels. Translators have
to be careful not too use too long words here...

* Media preferences: Fix typo "SoundFonts" -> "SoundFont"
The two popup menus, Video input/output, both use "<none>",
which when the catkeys are collected is reduced to one item.
Apparently, Italian likes to have different tranlsations for
them. I hope to fix that by using B_TRANSLATE_COMMENT with
differing comments. Not sure if that'll work...

* Network preferences: Localize "on/off" and "Enable/Disable"
in the Services.

* Repositories preferences:
Add RepoRow.cpp to DoCatalogs.

* Shortcuts preferences: Localize "Left/Right/Both/Either/None"

* Bluetooth replicant: Localize menu items and alerts.

* DeskCalc: Localize button names.

* HaikuDepot:
- Use BStringFormat and variables to replace for the WorkStatusView.
- Put package name in single quotes; nicer if you have package names
with spaces.
- Avoid leading and trailing spaces in translatable strings. Those
can be overlooked b the translator.
- Use B_UTF8_ELLIPSIS instead of "...".

Change-Id: Ia32908f9faad5188aa87c918c31229277decbda9
Reviewed-on: https://review.haiku-os.org/631
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

Network: fixed uninitialized members.

* CIDs 1251073, 1292681, 1292686, and 1292687 -- all irrelevant, though.

Network: moved commonly used classes into app.

* This way all add-ons share the same code, and also the same
translations.

Network: fixed uninitialized members.

* CIDs 1251073, 1292681, 1292686, and 1292687 -- all irrelevant, though.

Network: moved commonly used classes into app.

* This way all add-ons share the same code, and also the same
translations.