fix: Resolve home page latency, add robust language validation and testimonial fallback

app/routers/home.py

@@ -64,6 +64,12 @@ async def home_index(req: Request, lang: str = None):
     # Get language from query param or session
     if lang is None:
         lang = req.session.get("lang", "de")
+    
+    # Validate lang
+    if lang not in ["de", "en", "fr"]:
+        lang = "de"
+    
+
 
     req.session["lang"] = lang
     translations = load_translations(lang)
@@ -84,6 +90,10 @@ async def home_about(req: Request, lang: str = None):
     if lang is None:
         lang = req.session.get("lang", "de")
     
+    # Validate lang
+    if lang not in ["de", "en", "fr"]:
+        lang = "de"
+    
     req.session["lang"] = lang
     translations = load_translations(lang)
 
@@ -103,6 +113,10 @@ async def home_crew(req: Request, lang: str = None):
     if lang is None:
         lang = req.session.get("lang", "de")
     
+    # Validate lang
+    if lang not in ["de", "en", "fr"]:
+        lang = "de"
+    
     req.session["lang"] = lang
     translations = load_translations(lang)
     
@@ -133,6 +147,10 @@ async def home_hardware(req: Request, lang: str = None):
     """
     if lang is None:
         lang = req.session.get("lang", "de")
+    
+    # Validate lang
+    if lang not in ["de", "en", "fr"]:
+        lang = "de"
         
     req.session["lang"] = lang
     translations = load_translations(lang)
@@ -152,6 +170,10 @@ async def home_software(req: Request, lang: str = None):
     """
     if lang is None:
         lang = req.session.get("lang", "de")
+    
+    # Validate lang
+    if lang not in ["de", "en", "fr"]:
+        lang = "de"
         
     req.session["lang"] = lang
     translations = load_translations(lang)
@@ -171,6 +193,10 @@ async def home_impressum(req: Request, lang: str = None):
     """
     if lang is None:
         lang = req.session.get("lang", "de")
+    
+    # Validate lang
+    if lang not in ["de", "en", "fr"]:
+        lang = "de"
         
     req.session["lang"] = lang
     translations = load_translations(lang)
@@ -190,6 +216,10 @@ async def home_datenschutz(req: Request, lang: str = None):
     """
     if lang is None:
         lang = req.session.get("lang", "de")
+    
+    # Validate lang
+    if lang not in ["de", "en", "fr"]:
+        lang = "de"
         
     req.session["lang"] = lang
     translations = load_translations(lang)