en to eu translation catalogue (4 entries)

[ctx: Toolbar button tooltip for the Bold feature.]
en: Bold
eu: Lodia

[ctx: Toolbar button tooltip for the Italic feature.]
en: Italic
eu: Etzana

[ctx: Toolbar button tooltip for the Underline feature.]
en: Underline
eu: Azpimarra

[ctx: Toolbar button tooltip for the Code feature.]
en: Code
eu: Kodea
