Adopt courier font for headers and footers

Address issue: py-pdf/fpdf2#1090

Author: evilaliv3

backend/globaleaks/handlers/recipient/export.py

@@ -69,20 +69,22 @@ def __init__(self, *args, **kwargs):
             self.set_text_shaping(use_shaping_engine=True, direction="ltr")
 
         def header(self):
-            self.set_font(self.report_default_font, "", 9)
             self.cell(80)
+            self.set_font("courier", "", 9)
             self.set_text_shaping(use_shaping_engine=True, direction="ltr")
             self.cell(30, 10, self.title, align="C")
             self.set_text_shaping(use_shaping_engine=True, direction=self.report_direction)
+            self.set_font(self.report_default_font, "", 11)
             self.ln(20)
 
 
         def footer(self):
             self.set_y(-15)
-            self.set_font(self.report_default_font, "", 9)
+            self.set_font("courier", "", 9)
             self.set_text_shaping(use_shaping_engine=True, direction="ltr")
             self.cell(0, 10, f"{self.page_no()}/{{nb}}", align="C")
             self.set_text_shaping(use_shaping_engine=True, direction=self.report_direction)
+            self.set_font(self.report_default_font, "", 11)
 
         def output(self, *args, **kwargs):
             for font in list(self.fonts.keys()):