7678: some fixes around gettext and messages handling

gramps/gen/utils/image.py

@@ -46,6 +46,8 @@ import tempfile
 #
 #-------------------------------------------------------------------------
 from ..constfunc import conv_to_unicode
+from ..const import GRAMPS_LOCALE as glocale
+_ = glocale.translation.gettext
 
 def crop_percentage_to_subpixel(width, height, crop):
     """

gramps/plugins/lib/libhtmlbackend.py

@@ -46,6 +46,9 @@ from gramps.gen.plug.docbackend import DocBackend
 from gramps.plugins.lib.libhtml import Html, xml_lang
 from gramps.gen.errors import ReportError
 
+from gramps.const import GRAMPS_LOCALE as glocale
+_ = glocale.translation.gettext
+
 
 #------------------------------------------------------------------------
 #