[tracker] Restore Unicode quotation marks in a translatable string

[Piotr Drąg <piotrdrag src gnome org>]

commit cfd4170d22b655b9f43f301c3674939553e0fbb3
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Jul 15 23:11:42 2018 +0200

    Restore Unicode quotation marks in a translatable string
    
    Fixes regression in commit b458fda8fa03f5ec53f8de9edfeef1b7610aae9c.
    
    See https://developer.gnome.org/hig/stable/typography.html

 src/tracker/tracker-extract.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/tracker/tracker-extract.c b/src/tracker/tracker-extract.c
index 040fc059b..7a2a002e4 100644
--- a/src/tracker/tracker-extract.c
+++ b/src/tracker/tracker-extract.c
@@ -42,7 +42,7 @@ static GOptionEntry entries[] = {
          N_("Sets the logging verbosity to LEVEL (“debug”, “detailed”, “minimal”, “errors”) for all 
processes"),
          N_("LEVEL") },
        { "output-format", 'o', 0, G_OPTION_ARG_STRING, &output_format,
-         N_("Output results format: 'sparql', 'turtle' or 'json-ld'"),
+         N_("Output results format: “sparql”, “turtle” or “json-ld”"),
          N_("FORMAT") },
        { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &filenames,
          N_("FILE"),