fix(content): Address all user review feedback

- Replace Mitarbeiter with Mitarbeitenden
- Add specialization sentence to Kabeltiefbau
- Update Werkstatt Kabel link
- Add Karriere to main navigation
- Add Referenzen to Footer
- Fix 404 for EN legal pages by using consistent internal slugs

content/en/kabeltiefbau.mdx

@@ -24,19 +24,21 @@ layout: "fullBleed"
 
   Modern civil engineering is plagued by low-cost contractors who routinely **compromise on safety margins and technical documentation**. The repercussions are severe: catastrophic utility strikes (power, water, gas, telecom), costly project delays, and massive budget overruns. What begins as a low-bid shortcut quickly turns into a financial and legal nightmare.
 
-  ## Integrated Excellence from a Single Source
+  ## Everything from a single source
 
-  At E-TIB, we leverage decades of collective expertise to anticipate structural and geological bottlenecks long before the first shovel hits the ground.
+  E-TIB GmbH is fully specialized in cable network construction. Thanks to our many years of experience, we identify problems early on and develop safe and satisfactory solutions for our clients in advance.
 
-  We deliver turnkey cable routes entirely in-house. Our operations are powered by a cutting-edge fleet of heavy machinery and staffed exclusively by highly trained, permanent professionals. Working in close synergy with our sister firm, **E-TIB Ingenieurgesellschaft mbH**, we eliminate planning oversights at the inception phase and effortlessly handle the most complex GIS and administrative documentation requirements in the industry.
+  We offer you the complete range of services for the construction of cable routes from a single source - with our own ultra-modern machine park and permanently employed specialist staff. In direct cooperation with our partner office, E-TIB Ingenieurgesellschaft mbH, we can also rule out planning errors early on and master even the most complex documentation requirements confidently.
 
   <DataGridPulse />
 </div>
 
 <ServiceDetailGrid
-  badge="Service Portfolio"
-  title="Everything for Your Network"
-  descriptionParagraphs={[]}
+  badge="Service Spectrum"
+  title="Everything for your network"
+  descriptionParagraphs={[
+    "We offer the highest precision, state-of-the-art machinery, and certified experts for your project."
+  ]}
   panels={[
     {
       id: "grabenbau",