Mark messages for translation

With the translation infrastructure now in place, make sure to mark
every user-bound message for translation. All but one of the strings in
terminal.ui are already marked. This commit marks all remaining messages
in the Vala code as well as the missing one from terminal.ui.

One of the messages in terminal.ui is a sample error message for the
infobar label. Since this message will never be visible to the user (the
code overrides the label's contents with any relevant warning messages),
we do not need to keep it marked.

Finally, give translators ample context for what they will have to
translate and fix a small inconsistency with the capitalization of
warning messages in configreader.vala.

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