[Issue #195][WIP] refined country scope to case insensitive search
[Issue #195][WIP] fixed an accidental syntax error
[Issue #195][WIP] modified the documentation of search method in the controller
[Issue #195][WIP] Added a route for searching keywords
[Issue #195][WIP] removed redundant method suggest_add
[Issue #195][WIP] added search_keyword method to handle searching for keywords
[Issue #195][WIP] connected views to switch between searching for keywords and displaying synonyms
[Issue #195][WIP] updated yml translation files
[Issue #195][WIP] replaced a sentence by its translation function