I've made some changes to the unit_names.csv file, to update things like the descriptions of mechanised and motorised infantry to talk about reserve and guards instead.
Amended file is
here.
Changes are:
SNAME_MULTI_ROLE;2s F
SDESC_MULTI_ROLE;Two-Seater Wing
SDESC_TRANSPORT_PLANE;Airship Group
LDESC_INFANTRY;Infantry will most likely form the backbone of your army. They are relatively cheap to build and require no regular fuel supply to manoeuvre, but their speed of advance is limited. However, Infantry are able to occupy large areas of land, securing ground captured by other forces.
LDESC_CAVALRY;Cavalry are able to move fairly rapidly over most types of terrain and do not require a supply of fuel to operate, but they are lightly armed, and the automatic weapons of the time can inflict devastating casualties to both men and horses. That is not to say that Cavalry can't prove useful in some instances as a mobile reserve.
LDESC_MOTORIZED;Reserve Infantry are the volunteer and conscripted troops who formed the mass armies of the Great War. They are cheaper to train and equip than regular infantry, but also less effective, especially on the attack.
LDESC_MECHANIZED;Guards and Assault Divisions are the elite of the army. Given the first choice of men and equipment and trained with the latest doctrines, they are used to spearhead the most important offensives and counter-attacks.
LDESC_PARATROOPER;Light Infantry units lack the heavy artillery and other specialised equipment of regular divisions, but they make up for this in training and élan. They are particularly useful in areas with poor infrastructure such as mountains, deserts and jungles.
LDESC_CAS;Contour Bombers are heavily armoured against ground fire, giving them the ability to fly along the contours of the ground to strike precisely at enemy units, and so enabling your ground forces to achieve a breakthrough.
LDESC_INTERCEPTOR;Scout Fighters are the hunters of the sky. Fast, manoeuvreable and heavily armed, they are designed to win air superiority by pursuing and destroying enemy bombers and reconnaissance aircraft.
LDESC_MULTI_ROLE;Two-seat Fighters are larger and slower than scouts, but have the extra firepower of a rear gun and the ability to carry a small bomb load, making them more of a multi-purpose aircraft.
LDESC_TACTICAL_BOMBER;Reconnaissance aircraft and bombers are used to locate the enemy, produce detailed maps of their trenches, and then either direct artillery fire onto their positions, or attack them directly with bombs.
LDESC_TRANSPORT_PLANE;Flying high out of range of defensive fire, airships can carry an extremely heavy payload over long distances, making them ideal for strategic bombing. Their long range also makes them suitable for naval cooperation role. However, they are slow-moving, and will eventually become vulnerable to higher-performance aircraft.
LDESC_NAVAL_BOMBER;Seaplanes and Flying Boats are designed for use over water, scouting for enemy ships and submarines and then guiding friendly naval forces to their location. They can also make accurate tactical strikes against enemy surface vessels themselves using torpedoes or bombs.
I haven't changed any of the other language descriptions; that would need someone with the requisite language skills.