Fixed bugs and edited inadequate configs
Added a new modifier LanguageCondeModifier
Fixed a wrong conditional expression
Fixed a typo
fix arxiv BTE configuration
fix pubmed BTE configuration
fix crossref BTE configuration
fix 'BTE to DSpace' configuration
remove warning in LanguageCodeModifier
Merge pull request #386 from zuki/DS-1777

DS-1777 Bugs and inadequate configs for "Bibliographic import and lookup in Submission" and a new modifier