Hopefully fixed .htaccess

.htaccess

@@ -1,15 +1,10 @@
-RewriteEngine On
+<IfModule mod_rewrite.c>
+  RewriteEngine On
 
-RewriteBase /
+  RewriteCond %{HTTP:Accept-Language} ^de [NC]
+  RewriteRule ^$ /de/ [NC,R]
 
-RewriteRule ^../index\.html$ - [L]
-
-RewriteCond %{REQUEST_FILENAME} !-f
-RewriteCond %{REQUEST_FILENAME} !-d
-RewriteRule (..) $1/index.html [L]
-
-RewriteCond %{HTTP:Accept-Language} ^de [NC]
-RewriteRule ^$ /de/ [R]
-
-RewriteCond %{HTTP:Accept-Language} ^!de [NC]
-RewriteRule ^$ /en/ [R]
+  # Redirection of requests to index.html
+  RewriteCond %{HTTP:Accept-Language} ^!de [NC]
+  RewriteRule ^$ /en/ [NC,R]
+</IfModule>

angular.json

@@ -35,7 +35,8 @@
             "inlineStyleLanguage": "scss",
             "assets": [
               "src/favicon.ico",
-              "src/assets"
+              "src/assets",
+              "src/.htaccess"
             ],
             "styles": [
               "@angular/material/prebuilt-themes/deeppurple-amber.css",

src/.htaccess

@@ -0,0 +1,112 @@
+# Generated with ngx-htaccess-generator v1.2.4
+# Check for updates: https://julianpoemp.github.io/ngx-htaccess-generator/
+#
+# Transparency notice: Some parts were extracted from
+# Apache Server Configs v5.0.0 | MIT License
+# https://github.com/h5bp/server-configs-apache
+# Extracted parts are wrapped by "START Extract from ASC"
+
+<IfModule mod_headers.c>
+
+  # Remove X-Powerered-By header
+  Header unset X-Powered-By
+  Header always unset X-Powered-By
+</IfModule>
+
+<IfModule mod_rewrite.c>
+  RewriteEngine On
+
+  # Redirection of requests to index.html
+  RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -f [OR]
+  RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -d
+  RewriteRule ^.*$ - [NC,L]
+  # Redirect all non-file routes to index.html
+  RewriteRule ^(?!.*\.).*$ index.html [NC,L]
+</IfModule>
+
+<IfModule mod_mime.c>
+
+  ### START Extract from ASC
+  # Serve resources with the proper media types (f.k.a. MIME types).
+
+  # Data interchange
+
+  AddType application/atom+xml                        atom
+  AddType application/json                            json map topojson
+  AddType application/ld+json                         jsonld
+  AddType application/rss+xml                         rss
+  AddType application/geo+json                        geojson
+  AddType application/rdf+xml                         rdf
+  AddType application/xml                             xml
+
+  # JavaScript
+
+  # Servers should use text/javascript for JavaScript resources.
+  # https://html.spec.whatwg.org/multipage/scripting.html#scriptingLanguages
+
+  AddType text/javascript                             js mjs
+
+
+  # Manifest files
+
+  AddType application/manifest+json                   webmanifest
+  AddType application/x-web-app-manifest+json         webapp
+  AddType text/cache-manifest                         appcache
+
+
+  # Media files
+
+  AddType audio/mp4                                   f4a f4b m4a
+  AddType audio/ogg                                   oga ogg opus
+  AddType image/avif                                  avif
+  AddType image/avif-sequence                         avifs
+  AddType image/bmp                                   bmp
+  AddType image/jxl                                   jxl
+  AddType image/svg+xml                               svg svgz
+  AddType image/webp                                  webp
+  AddType video/mp4                                   f4v f4p m4v mp4
+  AddType video/ogg                                   ogv
+  AddType video/webm                                  webm
+  AddType video/x-flv                                 flv
+
+  # Serving `.ico` image files with a different media type prevents
+  # Internet Explorer from displaying them as images:
+  # https://github.com/h5bp/html5-boilerplate/commit/37b5fec090d00f38de64b591bcddcb205aadf8ee
+
+  AddType image/x-icon                                cur ico
+
+
+  # WebAssembly
+
+  AddType application/wasm                            wasm
+
+
+  # Web fonts
+
+  AddType font/woff                                   woff
+  AddType font/woff2                                  woff2
+  AddType application/vnd.ms-fontobject               eot
+  AddType font/ttf                                    ttf
+  AddType font/collection                             ttc
+  AddType font/otf                                    otf
+
+
+  # Other
+
+  AddType application/octet-stream                    safariextz
+  AddType application/x-bb-appworld                   bbaw
+  AddType application/x-chrome-extension              crx
+  AddType application/x-opera-extension               oex
+  AddType application/x-xpinstall                     xpi
+  AddType text/calendar                               ics
+  AddType text/markdown                               markdown md
+  AddType text/vcard                                  vcard vcf
+  AddType text/vnd.rim.location.xloc                  xloc
+  AddType text/vtt                                    vtt
+  AddType text/x-component                            htc
+
+  ### END Extract from ASC
+</IfModule>
+
+# Remove server signature
+ServerSignature Off