Make localization configurable through settings

Fixes #697

Work in progress.

Author: hiddewie

proxy/index.html

@@ -205,6 +205,29 @@ <h5 class="modal-title">Map configuration</h5>
               Control how stations are labeled on the map for zooms 5 to 10. From zoom 10 onwards, the names are always shown.
             </small>
           </div>
+          <div class="mb-3">
+            <label class="form-label">Localization</label>
+            <div>
+              <div class="form-check form-check-inline">
+                <input class="form-check-input" type="radio" name="localization" id="localizationDisabled" value="label" checked onchange="onLocalizationChange('off');">
+                <label class="form-check-label" for="localizationDisabled">Disabled</label>
+              </div>
+              <div class="form-check form-check-inline">
+                <input class="form-check-input" type="radio" name="localization" id="localizationAutomatic" value="name" onchange="onLocalizationChange('automatic');">
+                <label class="form-check-label" for="localizationAutomatic">Automatic</label>
+              </div>
+              <div class="form-check form-check-inline" style="margin-right: 0.3rem">
+                <input class="form-check-input" type="radio" name="localization" id="localizationCustom" value="name" onchange="onLocalizationChange('custom', document.getElementById('localizationCustomLanguage').value);">
+                <label class="form-check-label" for="localizationCustom">Custom: </label>
+              </div>
+              <div class="form-check form-check-inline" style="padding-left: 0; width: 5rem">
+                <input type="text" class="form-control" name="localization-language" onchange="onLocalizationChange('custom', this.value)" id="localizationCustomLanguage" />
+              </div>
+            </div>
+            <small class="form-text">
+              Control if localization is enabled, and what language is used. When specifying a language manually, use the language code as specified in <a href="https://en.wikipedia.org/wiki/ISO_639-1" target="_blank">ISO_639-1</a>, for example <code>en</code> for English.
+            </small>
+          </div>
         </form>
       </div>
     </div>