The "bold" and "italics" refer not to Klingon, but to how definitions are displayed in Latin script (Klingon in bold, English translation in italics, like in TKD).

--- begin quote ---

“Writing system” in general ({pIqaD} is just one of many in the world/galaxy) is {ghItlhmeH Ho’DoS} “system for writing.”  ({Ho’DoS} is “system, method, manner, technique.”  {pat} is “system” in the physical [or physical-like] sense, as in “computer system” [hardware or hardware and software together] or “transporter system” or “propulsion system.” {Ho’DoS} is not that.)

For “font” or “typeface,” you can use {ngutlh tu’qom} “written character appearance/form/shape.”

For “bold,” Maltz suggested {pI’} “fat.”  For “Italics,” he said {chongHa’} “un-vertical.”

--- end quote ---