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).
“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.”
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De'vID