feat: Extract translation text from html and finished the mainly translation of zh_CN, zh_TW, ja_JP file (#987)

* feat: translate zh_cn properties

* feat: adjust some description messages_zh_CN.properties

* feat: translate zh_TW file done

* feat: zh_CN semantic optimization

* feat: Supplementary ja_JP translation

* feat: extract rest text

* feat: Sync to all lang.properties

* feat: translate zh_CN, zh_TW, ja_JP file

* fix: small bug

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Co-authored-by: yanyu_lin <yanyu_lin@bestsign.cn>

src/main/resources/templates/remove-pages.html

@@ -18,7 +18,7 @@
                 <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
                 <div class="mb-3">
                   <label for="fileInput" th:text="#{pageRemover.pagesToDelete}"></label>
-                  <input type="text" class="form-control" id="fileInput" name="pageNumbers" placeholder="(e.g. 1,2,6 or 1-10,15-30)" required>
+                  <input type="text" class="form-control" id="fileInput" name="pageNumbers" th:placeholder="#{pageRemover.placeholder}" required>
                 </div>
                 <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{pageRemover.submit}"></button>
               </form>