po: Reset default xgettext keywords

The convention in the project is to use the short aliases for actual
literal translatable strings, and the long names when using variables
or similar.

dselect/po/Makevars

@@ -8,7 +8,7 @@ subdir = dselect/po
 top_builddir = ../..
 
 # These options get passed to xgettext.
-XGETTEXT_OPTIONS = --from-code=UTF-8 --keyword=_ --keyword=N_
+XGETTEXT_OPTIONS = --from-code=UTF-8 --keyword --keyword=_ --keyword=N_
 
 # This is the copyright holder that gets inserted into the header of the
 # $(DOMAIN).pot file.  Set this to the copyright holder of the surrounding

po/Makevars

@@ -8,7 +8,7 @@ subdir = po
 top_builddir = ..
 
 # These options get passed to xgettext.
-XGETTEXT_OPTIONS = --from-code=UTF-8 --keyword=_ --keyword=N_ \
+XGETTEXT_OPTIONS = --from-code=UTF-8 --keyword --keyword=_ --keyword=N_ \
                    --keyword=P_:1,2 --keyword=C_:1c,2
 
 # This is the copyright holder that gets inserted into the header of the

scripts/po/Makevars

@@ -8,7 +8,7 @@ subdir = scripts/po
 top_builddir = ../..
 
 # These options get passed to xgettext.
-XGETTEXT_OPTIONS = --from-code=UTF-8 --keyword=_g --keyword=P_:1,2
+XGETTEXT_OPTIONS = --from-code=UTF-8 --keyword --keyword=_g --keyword=P_:1,2
 
 # This is the copyright holder that gets inserted into the header of the
 # $(DOMAIN).pot file.  Set this to the copyright holder of the surrounding