Improve translations page

Conflicts:
	src/ch/uzh/ifi/attempto/acewiki/gui/TranslationsPage.java
Localization for translation menu item

Conflicts:
	src/ch/uzh/ifi/attempto/acewiki/gui/SentenceComponent.java
Improve details page
Add disambiguation dialog
No space between digits in GF sentences
Improve retrieval of application object; focus text area
Consider locale when sorting
No 'References' tab for general pages (was always empty)
Wrap ASCII representation on details page of GF sentences
Update Spanish localization files
No specific titles for error message window
Correct labels in registration window
No misleading use of 'disambiguate'; 'alternative' instead of 'variant'
Show alternatives on translation page
Update sentence objects when sentence is changed
Show all representations in details page
Merge remote-tracking branch 'origin/master' into gfservice

Conflicts:
	src/ch/uzh/ifi/attempto/acewiki/gf/GFDeclaration.java
	src/ch/uzh/ifi/attempto/acewiki/gf/GFGrammar.java
	src/ch/uzh/ifi/attempto/acewiki/gf/GfTextOperator.java
	src/ch/uzh/ifi/attempto/acewiki/gf/TreeSet.java
	src/ch/uzh/ifi/attempto/acewiki/gui/SentenceComponent.java
	src/ch/uzh/ifi/attempto/acewiki/gui/SentencePage.java
	src/ch/uzh/ifi/attempto/acewiki/gui/TranslationsPage.java
	src/ch/uzh/ifi/attempto/acewiki/text_en_US.properties
	src/ch/uzh/ifi/attempto/acewiki/text_es_ES.properties