make header slogan visible in dark mode

src/app/components/home/new-landing/new-landing.component.scss

@@ -2,7 +2,7 @@
   width: 100%;
   height: 60px;
   border-radius: 5px;
-  margin: 10% 0 18% 0;
+  margin: 10% 0 17% 0;
   font-size: large;
   background-color: var(--background);
   color: var(--on-background);

src/app/components/shared/header/header.component.scss

@@ -74,12 +74,14 @@ h2 {
   margin-right: 10px;
   margin-left: 120px;
   font-size: medium !important;
+  color: var(--on-background);
 }
 
 .header-slogan-mobile {
   margin-right: 10px;
   margin-left: 60px;
   font-size: medium !important;
+  color: var(--on-background);
 }
 
 .label-icon {

src/assets/i18n/home/de.json

@@ -194,7 +194,7 @@
     "restart-account-activation-correct": "Der Aktivierungs-Schlüssel wurde erneut gesendet.",
     "restart-account-activation-tooltip": "Sendet den Aktivierungs-Schlüssel erneut an die angegebene Adresse.",
     "welcome": "»Haben Sie Fragen?«",
-    "welcome-feedback": "➜ Feedback an die Entwickler von »frag.jetzt«",
+    "welcome-feedback": "➜ Feedback an das »frag.jetzt«-Team",
     "feedback-aria": "Baggs, Features, Lob und Tadel kannst du über diesen Link in unserer Feedback-Säschen äussern."
   },
   "overlay": {

src/assets/i18n/home/en.json

@@ -196,7 +196,7 @@
     "restart-account-activation-tooltip": "Sends the activation key again",
     "welcome": "»Any questions?«",
     "welcome-subtitle": "anonymous | in your browser | for free",
-    "welcome-feedback": "➜ Feedback to the developers of »frag.jetzt«",
+    "welcome-feedback": "➜ Feedback to the »frag.jetzt« team",
     "feedback-aria": "Please use the following Link to offer the developers bugs, features, praise and blame"
   },
   "overlay": {