Add translation support

i18n/en/cosmic_edit.ftl

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+new-document = New document
+open-project = Open project
+
+# Menu
+
+## File
+file = File
+new-file = New file
+new-window = New window
+open-file = Open file...
+open-recent = Open recent
+todo = TODO
+save = Save
+save-as = Save as...
+revert-all-changes = Revert all changes
+document-statistics = Document statistics...
+document-type = Document type...
+encoding = Encoding...
+print = Print
+quit = Quit
+
+## Edit
+edit = Edit
+undo = Undo
+redo = Redo
+cut = Cut
+copy = Copy
+paste = Pate
+find = Find
+replace = Replace
+spell-check = Spell check...
+
+## View
+view = View
+indentation = Indentation
+
+### Indentation
+automatic-indentation = Automatic Indentation
+tab-width = Tab width: {$tab_width}
+convert-indentation-to-spaces = Convert indentation to spaces
+convert-indentation-to-tabs = Convert indentation to tabs
+
+word-wrap = Word wrap
+show-line-numbers = Show line numbers
+highlight-current-line = Highlight current line
+syntax-highlighting = Syntax highlighting...
+settings = Settings...
+keyboard-shortcuts = Keyboard shortcuts...
+about-cosmic-text-editor = About COSMIC Text Editor