feat: sort languages in selection menu (#1071)

## Summary

* **What is the goal of this PR?** (e.g., Implements the new feature for
file uploading.)

Currently we are displaying the languages in the order they were added
(as in the `Language` enum). However, as new languages are coming in,
this will quickly be confusing to the users.

But we can't just change the ordering of the enum if we want to respect
bakwards compatibility.

So my proposal is to add a mapping of the alphabetical order of the
languages. I've made it so that it's generated by the `gen_i18n.py`
script, which will be used when a new language is added.


* **What changes are included?**

Added the array from the python script and changed
`LanguageSelectActivity` to use the indices from there. Also commited
the generated `I18nKeys.h`

## Additional Context

* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
  specific areas to focus on).

I was wondering if there is a better way to sort it. Currently, it's by
unicode value and Czech and Russian are last, which I don't know it it's
the most intuitive.

The current order is:
`Català, Deutsch, English, Español, Français, Português (Brasil),
Română, Svenska, Čeština, Русский`

---

### AI Usage

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Did you use AI tools to help write this code? _**< PARTIALLY >**_

src/activities/settings/LanguageSelectActivity.cpp

@@ -3,16 +3,22 @@
 #include <GfxRenderer.h>
 #include <I18n.h>
 
+#include <algorithm>
+#include <iterator>
+
+#include "I18nKeys.h"
 #include "MappedInputManager.h"
 #include "fontIds.h"
 
 void LanguageSelectActivity::onEnter() {
   Activity::onEnter();
 
-  totalItems = getLanguageCount();
-
   // Set current selection based on current language
-  selectedIndex = static_cast<int>(I18N.getLanguage());
+  const auto currentLang = static_cast<uint8_t>(I18N.getLanguage());
+  const auto* begin = std::begin(SORTED_LANGUAGE_INDICES);
+  const auto* end = std::end(SORTED_LANGUAGE_INDICES);
+  const auto* it = std::find(begin, end, currentLang);
+  selectedIndex = (it != end) ? std::distance(begin, it) : 0;
 
   requestUpdate();
 }
@@ -45,7 +51,7 @@ void LanguageSelectActivity::loop() {
 void LanguageSelectActivity::handleSelection() {
   {
     RenderLock lock(*this);
-    I18N.setLanguage(static_cast<Language>(selectedIndex));
+    I18N.setLanguage(static_cast<Language>(SORTED_LANGUAGE_INDICES[selectedIndex]));
   }
 
   // Return to previous page
@@ -61,13 +67,16 @@ void LanguageSelectActivity::render(Activity::RenderLock&&) {
 
   GUI.drawHeader(renderer, Rect{0, metrics.topPadding, pageWidth, metrics.headerHeight}, tr(STR_LANGUAGE));
 
+  // Current language marker
   const int contentTop = metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing;
   const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing;
-  const int currentLang = static_cast<int>(I18N.getLanguage());
+  const auto currentLang = static_cast<uint8_t>(I18N.getLanguage());
   GUI.drawList(
       renderer, Rect{0, contentTop, pageWidth, contentHeight}, totalItems, selectedIndex,
-      [this](int index) { return I18N.getLanguageName(static_cast<Language>(index)); }, nullptr, nullptr,
-      [this, currentLang](int index) { return index == currentLang ? tr(STR_SET) : ""; }, true);
+      [this](int index) { return I18N.getLanguageName(static_cast<Language>(SORTED_LANGUAGE_INDICES[index])); },
+      nullptr, nullptr,
+      [this, currentLang](int index) { return SORTED_LANGUAGE_INDICES[index] == currentLang ? tr(STR_SET) : ""; },
+      true);
 
   // Button hints
   const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));

src/activities/settings/LanguageSelectActivity.h

@@ -31,5 +31,5 @@ class LanguageSelectActivity final : public Activity {
   std::function<void()> onBack;
   ButtonNavigator buttonNavigator;
   int selectedIndex = 0;
-  int totalItems = 0;
+  constexpr static uint8_t totalItems = getLanguageCount();
 };