Refactoring, new translations, cleaning up warnings.

Refactored to standard Maven layout:
src/main/java
src/main/resources
src/test/java
etc.

New translation code that uses locale-specific ResourceBundles
to load translations on demand.

Reworked API error/exceptions code to a shorter, simpler
@ApiErrors annotation. Processing of @ApiErrors annotations
produces an example for each possible API error and includes
API error string in HTTP response code, e.g.
400 INVALID_SIGNATURE
Missing API error cases added to each API call.

Translation of openAPI.json removed (for now).

block-explorer.html and BIP39 wordlists now read as resources
instead of direct from disk.

Java compile warnings fixed.
Some runtime warnings remain:

WARNING: A provider api.resource.ApiDefinition registered in SERVER runtime does not implement any provider interfaces applicable in the SERVER runtime.
WARNING: A provider api.resource.AnnotationPostProcessor registered in SERVER runtime does not implement any provider interfaces applicable in the SERVER runtime.
WARN org.reflections.Reflections - given scan urls are empty. set urls in the configuration

src/main/resources/i18n/ApiError_de.properties

@@ -0,0 +1,72 @@
+UNKNOWN=Unbekannter Fehler
+JSON=JSON Nachricht konnte nicht geparsed werden
+NO_BALANCE=Guthaben ungenügend
+NOT_YET_RELEASED=Feature wurde noch nicht veröffentlicht
+INVALID_SIGNATURE=Ungültige Signatur
+INVALID_ADDRESS=Ungültige Adresse
+INVALID_SEED=Ungültiger Seed
+INVALID_AMOUNT=Ungültiger Betrag
+INVALID_FEE=Ungültige Gebühr
+INVALID_SENDER=Ungültiger Sender
+INVALID_RECIPIENT=Ungültiger Empfänger
+INVALID_NAME_LENGTH=Ungültige Namenslänge
+INVALID_VALUE_LENGTH=Ungültige Wertlänge
+INVALID_NAME_OWNER=Ungültiger Namensbesitzer
+INVALID_BUYER=Ungültiger Käufer
+INVALID_PUBLIC_KEY=Ungültiger Public Key
+INVALID_OPTIONS_LENGTH=Ungültige Optionen-Länge
+INVALID_OPTION_LENGTH=Ungültige Optionslänge
+INVALID_DATA=Ungültige Daten
+INVALID_DATA_LENGTH=Ungültige Datenlänge
+INVALID_UPDATE_VALUE=Ungültiger Update-Wert
+KEY_ALREADY_EXISTS=Der Schlüssel existiert bereits, Editieren ist deaktiviert
+KEY_NOT_EXISTS=Der Schlüssel existiert nicht
+LAST_KEY_IS_DEFAULT_KEY_ERROR=Du kannst den Schlüssel '${key}' nicht löschen, wenn er der einzige ist
+FEE_LESS_REQUIRED=fee less required
+WALLET_NOT_IN_SYNC=Das Wallet muss synchronisiert werden
+INVALID_NETWORK_ADDRESS=Ungültige Netzwerkadresse
+WALLET_NO_EXISTS=Das Wallet existiert nicht
+WALLET_ADDRESS_NO_EXISTS=Die Adresse existiert nicht im Wallet
+WALLET_LOCKED=Das Wallet ist abgeschlossen
+WALLET_ALREADY_EXISTS=Das Wallet existiert bereits
+WALLET_API_CALL_FORBIDDEN_BY_USER=Der Benutzer hat den API-Aufruf abgelehnt
+BLOCK_NO_EXISTS=Der Block existiert nicht
+TRANSACTION_NO_EXISTS=Die Transaktion existiert nicht
+PUBLIC_KEY_NOT_FOUND=Public Key wurde nicht gefunden
+NAME_NO_EXISTS=Der Name existiert nicht
+NAME_ALREADY_EXISTS=Der Name existiert bereits
+NAME_ALREADY_FOR_SALE=Der Name steht bereits zum Verkauf
+NAME_NOT_LOWER_CASE=Der Name muss aus Kleinbuchstaben bestehen
+NAME_SALE_NO_EXISTS=Namensverkauf existiert nicht
+BUYER_ALREADY_OWNER=Der Käufer ist bereits Besitzer
+POLL_NO_EXISTS=Die Abstimmung existiert nicht
+POLL_ALREADY_EXISTS=Die Abstimmung existiert bereits
+DUPLICATE_OPTION=Nicht alle Optionen sind eindeutig
+POLL_OPTION_NO_EXISTS=Die option existiert nicht
+ALREADY_VOTED_FOR_THAT_OPTION=Bereits für diese Option abgestimmt
+INVALID_ASSET_ID=Ungültige Asset ID
+NAME_NOT_REGISTERED=?NAME_NOT_REGISTERED?
+NAME_FOR_SALE=?NAME_FOR_SALE?
+NAME_WITH_SPACE=?NAME_WITH_SPACE?
+INVALID_DESC_LENGTH=Ungültige Beschreibungslänge. Max. Länge ${MAX_LENGTH}
+EMPTY_CODE=Der Code ist leer
+DATA_SIZE=Ungültige Datenlänge
+NULL_PAGES=Ungültige Seiten
+INVALID_TYPE_LENGTH=Ungültige Typlänge
+INVALID_TAGS_LENGTH=Ungültige Tag-Länge
+INVALID_CREATION_BYTES=Fehler in Creation Bytes
+BODY_EMPTY=invalid body it must not be empty
+BLOG_DISABLED=Dieser Blog ist deaktiviert
+NAME_NOT_OWNER=the creator address does not own the author name
+TX_AMOUNT=the data size is too large - currently only ${BATCH_TX_AMOUNT} arbitrary transactions are allowed at once!
+BLOG_ENTRY_NO_EXISTS=transaction with this signature contains no entries!
+BLOG_EMPTY=this blog is empty
+POSTID_EMPTY=the attribute postid is empty! this is the signature of the post you want to comment
+POST_NOT_EXISTING=for the given postid no blogpost to comment was found
+COMMENTING_DISABLED=commenting is for this blog disabled
+COMMENT_NOT_EXISTING=for the given signature no comment was found
+INVALID_COMMENT_OWNER=invalid comment owner
+MESSAGE_FORMAT_NOT_HEX=the Message format is not hex - correct the text or use isTextMessage = true
+MESSAGE_BLANK=The message attribute is missing or content is blank
+NO_PUBLIC_KEY=The recipient has not yet performed any action in the blockchain.\nYou can't send an encrypted message to him.
+MESSAGESIZE_EXCEEDED=Message size exceeded!

src/main/resources/i18n/ApiError_en.properties

@@ -0,0 +1,95 @@
+# Keys are from api.ApiError enum
+
+# Common
+UNKNOWN=unknown error
+JSON=failed to parse json message
+NO_BALANCE=not enough balance
+NOT_YET_RELEASED=that feature is not yet released
+UNAUTHORIZED=api call unauthorized
+REPOSITORY_ISSUE=repository error
+
+# Validation
+INVALID_SIGNATURE=invalid signature
+INVALID_ADDRESS=invalid address
+INVALID_SEED=invalid seed
+INVALID_AMOUNT=invalid amount
+INVALID_FEE=invalid fee
+INVALID_SENDER=invalid sender
+INVALID_RECIPIENT=invalid recipient
+INVALID_NAME_LENGTH=invalid name length
+INVALID_VALUE_LENGTH=invalid value length
+INVALID_NAME_OWNER=invalid name owner
+INVALID_BUYER=invalid buyer
+INVALID_PUBLIC_KEY=invalid public key
+INVALID_OPTIONS_LENGTH=invalid options length
+INVALID_OPTION_LENGTH=invalid option length
+INVALID_DATA=invalid data
+INVALID_DATA_LENGTH=invalid data length
+INVALID_UPDATE_VALUE=invalid update value
+KEY_ALREADY_EXISTS=key already exists, edit is false
+KEY_NOT_EXISTS=the key does not exist
+FEE_LESS_REQUIRED=fee less required
+WALLET_NOT_IN_SYNC=wallet needs to be synchronized
+INVALID_NETWORK_ADDRESS=invalid network address
+ADDRESS_NO_EXISTS=account address does not exist
+INVALID_CRITERIA=invalid search criteria
+
+# Wallet
+WALLET_NO_EXISTS=wallet does not exist
+WALLET_ADDRESS_NO_EXISTS=address does not exist in wallet
+WALLET_LOCKED=wallet is locked
+WALLET_ALREADY_EXISTS=wallet already exists
+WALLET_API_CALL_FORBIDDEN_BY_USER=wallet denied api call
+
+# Blocks
+BLOCK_NO_EXISTS=block does not exist
+
+# Transactions
+TRANSACTION_NO_EXISTS=transaction does not exist
+PUBLIC_KEY_NOT_FOUND=public key not found
+
+# Names
+NAME_NO_EXISTS=name does not exist
+NAME_ALREADY_EXISTS=name already exists
+NAME_ALREADY_FOR_SALE=name already for sale
+NAME_NOT_LOWER_CASE=name must be lower case
+NAME_SALE_NO_EXISTS=namesale does not exist
+BUYER_ALREADY_OWNER=buyer is already owner
+
+# Voting
+POLL_NO_EXISTS=poll does not exist
+POLL_ALREADY_EXISTS=poll already exists
+DUPLICATE_OPTION=not all options are unique
+POLL_OPTION_NO_EXISTS=option does not exist
+ALREADY_VOTED_FOR_THAT_OPTION=already voted for that option
+
+# Assets
+INVALID_ASSET_ID=invalid asset id
+INVALID_ORDER_ID=invalid asset order id
+ORDER_NO_EXISTS=unknown asset order id
+
+# ATs
+EMPTY_CODE=code is empty
+DATA_SIZE=invalid data length
+NULL_PAGES=invalid pages
+INVALID_TYPE_LENGTH=invalid type length
+INVALID_TAGS_LENGTH=invalid tags length
+INVALID_CREATION_BYTES=error in creation bytes
+
+# Blogs/Name-storage
+BODY_EMPTY=invalid body it must not be empty
+BLOG_DISABLED=this blog is disabled
+NAME_NOT_OWNER=the creator address does not own the author name
+BLOG_ENTRY_NO_EXISTS=transaction with this signature contains no entries!
+BLOG_EMPTY=this blog is empty
+POSTID_EMPTY=the attribute postid is empty! this is the signature of the post you want to comment
+POST_NOT_EXISTING=for the given postid no blogpost to comment was found
+COMMENTING_DISABLED=commenting is for this blog disabled
+COMMENT_NOT_EXISTING=for the given signature no comment was found
+INVALID_COMMENT_OWNER=invalid comment owner
+
+# Messages
+MESSAGE_FORMAT_NOT_HEX=the Message format is not hex - correct the text or use isTextMessage = true
+MESSAGE_BLANK=The message attribute is missing or content is blank
+NO_PUBLIC_KEY=The recipient has not yet performed any action in the blockchain.\nYou can't send an encrypted message to them.
+MESSAGESIZE_EXCEEDED=Message size exceeded!

src/main/resources/i18n/TransactionValidity_en.properties

@@ -0,0 +1,42 @@
+OK=OK
+INVALID_ADDRESS=INVALID_ADDRESS
+NEGATIVE_AMOUNT=NEGATIVE_AMOUNT
+NEGATIVE_FEE=NEGATIVE_FEE
+NO_BALANCE=NO_BALANCE
+INVALID_REFERENCE=INVALID_REFERENCE
+INVALID_NAME_LENGTH=INVALID_NAME_LENGTH
+INVALID_VALUE_LENGTH=INVALID_VALUE_LENGTH
+NAME_ALREADY_REGISTERED=NAME_ALREADY_REGISTERED
+NAME_DOES_NOT_EXIST=NAME_DOES_NOT_EXIST
+INVALID_NAME_OWNER=INVALID_NAME_OWNER
+NAME_ALREADY_FOR_SALE=NAME_ALREADY_FOR_SALE
+NAME_NOT_FOR_SALE=NAME_NOT_FOR_SALE
+BUYER_ALREADY_OWNER=BUYER_ALREADY_OWNER
+INVALID_AMOUNT=INVALID_AMOUNT
+INVALID_SELLER=INVALID_SELLER
+NAME_NOT_LOWER_CASE=NAME_NOT_LOWER_CASE
+INVALID_DESCRIPTION_LENGTH=INVALID_DESCRIPTION_LENGTH
+INVALID_OPTIONS_COUNT=INVALID_OPTIONS_COUNT
+INVALID_OPTION_LENGTH=INVALID_OPTION_LENGTH
+DUPLICATE_OPTION=DUPLICATE_OPTION
+POLL_ALREADY_EXISTS=POLL_ALREADY_EXISTS
+POLL_DOES_NOT_EXIST=POLL_DOES_NOT_EXIST
+POLL_OPTION_DOES_NOT_EXIST=POLL_OPTION_DOES_NOT_EXIST
+ALREADY_VOTED_FOR_THAT_OPTION=ALREADY_VOTED_FOR_THAT_OPTION
+INVALID_DATA_LENGTH=INVALID_DATA_LENGTH
+INVALID_QUANTITY=INVALID_QUANTITY
+ASSET_DOES_NOT_EXIST=ASSET_DOES_NOT_EXIST
+INVALID_RETURN=INVALID_RETURN
+HAVE_EQUALS_WANT=HAVE_EQUALS_WANT
+ORDER_DOES_NOT_EXIST=ORDER_DOES_NOT_EXIST
+INVALID_ORDER_CREATOR=INVALID_ORDER_CREATOR
+INVALID_PAYMENTS_COUNT=INVALID_PAYMENTS_COUNT
+NEGATIVE_PRICE=NEGATIVE_PRICE
+INVALID_CREATION_BYTES=INVALID_CREATION_BYTES
+INVALID_TAGS_LENGTH=INVALID_TAGS_LENGTH
+INVALID_AT_TYPE_LENGTH=INVALID_AT_TYPE_LENGTH
+INVALID_AT_TRANSACTION=INVALID_AT_TRANSACTION
+AT_IS_FINISHED=AT_IS_FINISHED
+ASSET_DOES_NOT_MATCH_AT=ASSET_DOES_NOT_MATCH_AT
+ASSET_ALREADY_EXISTS=ASSET_ALREADY_EXISTS
+NOT_YET_RELEASED=NOT_YET_RELEASED