added the controller

src/main/java/polish_community_group_11/polish_community/translation/controller/TranslationApisController.java

+package polish_community_group_11.polish_community.translation.controller;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import polish_community_group_11.polish_community.translation.model.Translation;
+import polish_community_group_11.polish_community.translation.service.TranslationService;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/translations")
+public class TranslationApisController {
+
+    private final TranslationService translationService;
+
+    public TranslationApisController(TranslationService translationService) {
+        this.translationService = translationService;
+    }
+
+    // get all translations
+    @GetMapping
+    public ResponseEntity<List<Translation>> getAllTranslations() {
+        List<Translation> translations = translationService.getAllTranslations();
+        return ResponseEntity.ok(translations);
+    }
+
+    // for specific lang
+    @GetMapping("/language/{language}")
+    public ResponseEntity<List<Translation>> getTranslationsByLanguage(@PathVariable String language) {
+        List<Translation> translations = translationService.getTranslationsByLanguage(language);
+        return ResponseEntity.ok(translations);
+    }
+
+    // for specific key and lang
+    @GetMapping("/{key}/language/{language}")
+    public ResponseEntity<Translation> getTranslationByKeyAndLanguage(
+            @PathVariable String key,
+            @PathVariable String language) {
+        Translation translation = translationService.getTranslationByKeyAndLanguage(key, language);
+        if (translation == null) {
+            return ResponseEntity.notFound().build();
+        }
+        return ResponseEntity.ok(translation);
+    }
+
+    // adding new translation
+    @PostMapping
+    public ResponseEntity<String> addTranslation(@RequestBody Translation translation) {
+        translationService.addTranslation(translation);
+        return ResponseEntity.ok("Translation added successfully.");
+    }
+
+    // update existing
+    @PutMapping("/{id}")
+    public ResponseEntity<String> updateTranslation(@PathVariable int id, @RequestBody Translation translation) {
+        translationService.updateTranslation(id, translation);
+        return ResponseEntity.ok("Translation updated successfully.");
+    }
+
+    // deleting a translation
+    @DeleteMapping("/{id}")
+    public ResponseEntity<String> deleteTranslation(@PathVariable int id) {
+        translationService.deleteTranslation(id);
+        return ResponseEntity.ok("Translation deleted successfully.");
+    }
+
+    // get all unique keys
+    @GetMapping("/keys")
+    public ResponseEntity<List<String>> getAllTranslationKeys() {
+        List<String> keys = translationService.getAllTranslationKeys();
+        return ResponseEntity.ok(keys);
+    }
+
+    // get all translations for a specific key across all langs
+    @GetMapping("/keys/{key}")
+    public ResponseEntity<List<Translation>> getTranslationsByKey(@PathVariable String key) {
+        List<Translation> translations = translationService.getTranslationsByKey(key);
+        return ResponseEntity.ok(translations);
+    }
+}