fix #2044 add LanguageHelper

...rg/codelibs/fess/ds/callback/IndexUpdateCallbackImpl.java

src/main/java/org/codelibs/fess/helper/LanguageHelper.java

src/main/java/org/codelibs/fess/indexer/IndexUpdater.java

.../java/org/codelibs/fess/mylasta/direction/FessConfig.java

...in/java/org/codelibs/fess/mylasta/direction/FessProp.java

src/main/java/org/codelibs/fess/util/ComponentUtil.java

src/main/resources/fess.xml

src/main/resources/fess_config.properties

src/main/resources/fess_indices/fess.json