metadata: Fix summary

Closes https://gitlab.gnome.org/World/Authenticator/-/issues/395

Authenticator.doap

@@ -7,7 +7,7 @@
 
   <name xml:lang="en">Authenticator</name>
   <shortdesc xml:lang="en">
-      Generate Two-Factor Codes
+      Generate two-factor codes
   </shortdesc>
   <bug-database rdf:resource="https://gitlab.gnome.org/World/Authenticator" />
 

README.md

@@ -6,7 +6,7 @@
 
 <img src="https://gitlab.gnome.org/bilelmoussaoui/authenticator/raw/master/data/icons/com.belmoussaoui.Authenticator.svg" width="128px" height="128px" />
 
-<p>Generate Two-Factor Codes</p>
+<p>Generate two-factor codes</p>
 
 ## Screenshots
 

data/com.belmoussaoui.Authenticator.desktop.in.in

@@ -1,7 +1,7 @@
 [Desktop Entry]
 Name=Authenticator
 GenericName=Two-Factor Authentication
-Comment=Generate Two-Factor Codes
+Comment=Generate two-factor codes
 Type=Application
 Exec=authenticator %u
 Terminal=false

data/com.belmoussaoui.Authenticator.metainfo.xml.in.in

@@ -5,7 +5,7 @@
   <metadata_license>CC0</metadata_license>
   <project_license>GPL-3.0-or-later</project_license>
   <name>Authenticator</name>
-  <summary>Generate Two-Factor Codes</summary>
+  <summary>Generate two-factor codes</summary>
   <description>
     <p>Simple application for generating Two-Factor Authentication Codes.</p>
     <p>Features:</p>

src/application.rs

@@ -91,7 +91,7 @@ mod imp {
                         .application_name(gettext("Authenticator"))
                         .modal(true)
                         .version(config::VERSION)
-                        .comments(gettext("Generate Two-Factor Codes"))
+                        .comments(gettext("Generate two-factor codes"))
                         .website("https://gitlab.gnome.org/World/Authenticator")
                         .developers(vec![
                             "Bilal Elmoussaoui",