Alain Portal's patch, https://lists.launchpad.net/kicad-developers/msg04750.html

resources/linux/mime/applications/eeschema.desktop

 [Desktop Entry]
 Categories=Development;Electronics
-Comment=Design a printed circuit board.
+Comment=Design an electronic schematic
+Comment[fr]=Dessiner des schémas électroniques
 Exec=eeschema
-GenericName=EDA Suite
+GenericName=Electronic schematic design
+GenericName[fr]=Saisie de schéma électronique
 Icon=eeschema
 MimeType=application/x-kicad-schematic;
 Name=Eeschema

resources/linux/mime/applications/kicad.desktop

 [Desktop Entry]
 Categories=Development;Electronics
-Comment=Design a printed circuit board.
+Comment=Design a printed circuit board
+Comment[fr]=Concevoir un circuit imprimé
 Exec=kicad
 GenericName=EDA Suite
+GenericName[fr]=Suite logicielle de conception électronique
 Icon=kicad
 MimeType=application/x-kicad-project;
 Name=KiCad

resources/linux/mime/mime/packages/kicad.xml

@@ -3,11 +3,19 @@
 	<mime-type type="application/x-kicad-project">
 		<sub-class-of type="text/plain"/>
 		<comment>KiCad Project</comment>
+		<comment xml:lang="fr">Projet KiCad</comment>
 		<glob pattern="*.pro"/>
 	</mime-type>
 	<mime-type type="application/x-kicad-schematic">
 		<sub-class-of type="text/plain"/>
 		<comment>KiCad Schematic</comment>
+		<comment xml:lang="fr">Schéma électronique KiCad</comment>
 		<glob pattern="*.sch"/>
 	</mime-type>
+	<mime-type type="application/x-kicad-pcbnew">
+		<sub-class-of type="text/plain"/>
+		<comment>KiCad PCB</comment>
+		<comment xml:lang="fr">Circuit imprimé KiCad</comment>
+		<glob pattern="*.brd"/>
+	</mime-type>
 </mime-info>

resources/linux/mime/mimelnk/application/x-kicad-project.desktop

-
 [Desktop Entry]
 Type=MimeType
 MimeType=application/x-kicad-project
 Icon=kicad
 Patterns=*.pro
 Comment=KiCad Project
+Comment[fr]=Projet KiCad

resources/linux/mime/mimelnk/application/x-kicad-schematic.desktop

-
 [Desktop Entry]
 Type=MimeType
 MimeType=application/x-kicad-schematic
 Icon=eeschema
 Patterns=*.sch
 Comment=KiCad Schematic
+Comment[fr]=Schéma électronique KiCad