change dockerfile memo language to english

docker/hubserving/cpu/Dockerfile

 # Version: 1.0.0
 FROM hub.baidubce.com/paddlepaddle/paddle:latest-gpu-cuda9.0-cudnn7-dev
 
-# PaddleOCR需要在Python3.7下执行
+# PaddleOCR base on Python3.7
 RUN pip3.7 install --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple
 
 RUN python3.7 -m pip install paddlepaddle==1.7.2 -i https://pypi.tuna.tsinghua.edu.cn/simple
@@ -15,11 +15,11 @@ WORKDIR /PaddleOCR
 RUN pip3.7 install -r requirments.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
 
 RUN mkdir -p /PaddleOCR/inference
-# 下载超轻量级中文OCR模型的检测模型并解压（可以换成通用中文OCR模型，ch_det_r50_vd_db_infer，记得要修改deploy/hubserving/ocr_system/params.py中的det_model_dir）
+# Download orc detect model(light version). if you want to change normal version, you can change ch_det_mv3_db_infer to ch_det_r50_vd_db_infer, also remember change det_model_dir in deploy/hubserving/ocr_system/params.py）
 ADD https://paddleocr.bj.bcebos.com/ch_models/ch_det_mv3_db_infer.tar /PaddleOCR/inference
 RUN tar xf /PaddleOCR/inference/ch_det_mv3_db_infer.tar -C /PaddleOCR/inference
 
-# 下载超轻量级中文OCR模型的识别模型并解压（可以换成通用中文OCR模型，ch_rec_r34_vd_crnn_enhance_infer，记得要修改deploy/hubserving/ocr_system/params.py中的rec_model_dir）
+# Download orc recognition model(light version). If you want to change normal version, you can change ch_rec_mv3_crnn_infer to ch_rec_r34_vd_crnn_enhance_infer, also remember change rec_model_dir in deploy/hubserving/ocr_system/params.py）
 ADD https://paddleocr.bj.bcebos.com/ch_models/ch_rec_mv3_crnn_infer.tar /PaddleOCR/inference
 RUN tar xf /PaddleOCR/inference/ch_rec_mv3_crnn_infer.tar -C /PaddleOCR/inference
 

docker/hubserving/gpu/Dockerfile

 # Version: 1.0.0
 FROM hub.baidubce.com/paddlepaddle/paddle:latest-gpu-cuda10.0-cudnn7-dev
 
-# PaddleOCR需要在Python3.7下执行
+# PaddleOCR base on Python3.7
 RUN pip3.7 install --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple
 
 RUN python3.7 -m pip install paddlepaddle-gpu==1.7.2.post107 -i https://pypi.tuna.tsinghua.edu.cn/simple
@@ -14,12 +14,12 @@ WORKDIR /home/PaddleOCR
 
 RUN pip3.7 install -r requirments.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
 
-RUN mkdir -p /home/PaddleOCR/inference
-# 下载超轻量级中文OCR模型的检测模型并解压（可以换成通用中文OCR模型，ch_det_r50_vd_db_infer，记得要修改deploy/hubserving/ocr_system/params.py中的det_model_dir）
+RUN mkdir -p /PaddleOCR/inference
+# Download orc detect model(light version). if you want to change normal version, you can change ch_det_mv3_db_infer to ch_det_r50_vd_db_infer, also remember change det_model_dir in deploy/hubserving/ocr_system/params.py）
 ADD https://paddleocr.bj.bcebos.com/ch_models/ch_det_mv3_db_infer.tar /PaddleOCR/inference
 RUN tar xf /PaddleOCR/inference/ch_det_mv3_db_infer.tar -C /PaddleOCR/inference
 
-# 下载超轻量级中文OCR模型的识别模型并解压（可以换成通用中文OCR模型，ch_rec_r34_vd_crnn_enhance_infer，记得要修改deploy/hubserving/ocr_system/params.py中的rec_model_dir）
+# Download orc recognition model(light version). If you want to change normal version, you can change ch_rec_mv3_crnn_infer to ch_rec_r34_vd_crnn_enhance_infer, also remember change rec_model_dir in deploy/hubserving/ocr_system/params.py）
 ADD https://paddleocr.bj.bcebos.com/ch_models/ch_rec_mv3_crnn_infer.tar /PaddleOCR/inference
 RUN tar xf /PaddleOCR/inference/ch_rec_mv3_crnn_infer.tar -C /PaddleOCR/inference