Added logic to load translations and to translate texts

src/cpl_translation/translation_service_abc.py

@@ -0,0 +1,22 @@
+from abc import ABC, abstractmethod
+
+
+class TranslationServiceABC(ABC):
+
+    @abstractmethod
+    def __init__(self): pass
+
+    @abstractmethod
+    def set_default_lang(self, lang: str): pass
+
+    @abstractmethod
+    def set_lang(self, lang: str): pass
+
+    @abstractmethod
+    def load(self, lang: str): pass
+
+    @abstractmethod
+    def load_by_settings(self): pass
+
+    @abstractmethod
+    def translate(self, key: str) -> str: pass