<feature> add custom deepl translation

update version to v2.5.4

src/custom.txt

@@ -1 +1 @@
-{"Caiyun(Token Required)": {"url": "https://fanyi.caiyunapp.com/", "key_edit": true, "secret_edit": false, "is_queue": true, "target": "caiyun.target.rst", "source": "caiyun.source.rst", "file_name": "caiyun.py"}, "Baidu(Token Required)": {"url": "https://fanyi-api.baidu.com/", "key_edit": true, "secret_edit": true, "is_queue": false, "target": "baidu.target.rst", "source": "baidu.source.rst", "file_name": "baidu.py"}}
+{"Caiyun(Token Required)": {"url": "https://fanyi.caiyunapp.com/", "key_edit": true, "secret_edit": false, "is_queue": true, "target": "caiyun.target.rst", "source": "caiyun.source.rst", "file_name": "caiyun.py"}, "Baidu(Token Required)": {"url": "https://fanyi-api.baidu.com/", "key_edit": true, "secret_edit": true, "is_queue": false, "target": "baidu.target.rst", "source": "baidu.source.rst", "file_name": "baidu.py"}, "DeepL Custom(Token Required)": {"url": "https://www.deepl.com/account/?utm_source=github&utm_medium=github-python-readme", "key_edit": true, "secret_edit": false, "is_queue": true, "target": "deepl.target.rst", "source": "deepl.source.rst", "file_name": "deepl_custom.py"}}

src/custom_engine/deepl_custom.py

@@ -0,0 +1,46 @@
+# if your api can not input untranslated list such as ['Hello','World']
+# but can only accept single text input like 'Hello World'
+# use this api , the example is baidu.py
+
+
+def tranlate_single(app_key, app_secret, source, target, proxies, text):
+    # return translated_text
+    pass
+
+
+# otherwise,use this api
+# notice that, any other function call should not be out of this function
+# you can directly include other function in this function ,like tranlate_deepl , otherwise will cause NameError
+def tranlate_queue(app_key, app_secret, source, target, proxies, q):
+    # write import inside the function , otherwise will cause NameError
+    import json
+    import requests
+    import traceback
+    import deepl
+    class TranslateResponse:
+        def __init__(self, res):
+            self.detected_source_lang = res.detected_source_lang
+            self.translatedText = res.text
+
+    def tranlate_deepl(token, source, target, proxies, q):
+        translator = deepl.Translator(token, proxy=proxies)
+        result = translator.translate_text(q, target_lang=target, source_lang=source)
+        l = []
+        for i, e in enumerate(result):
+            translateResponse = TranslateResponse(e)
+            dic = dict()
+            dic['untranslatedText'] = q[i]
+            dic['translatedText'] = translateResponse.translatedText
+            l.append(dic)
+        # you are supposed to return a list
+        # the list item should be a dict which contains two keys
+        # 'untranslatedText' : the original text
+        # 'translatedText : the translated text
+        return l
+
+    return tranlate_deepl(app_key, source, target, proxies, q)
+
+
+# source = ["Deepl is the best translation service.", "How are you"]
+# result = tranlate_queue('app_key', None, 'EN', 'ZH', None, source)
+# print(result)

src/supported_language/deepl.source.rst

@@ -1,4 +1,3 @@
-Auto Detect:AUTO
 Bulgarian:BG
 Czech:CS
 Danish:DA